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Buy from Amazon $31.23$0.01 $37.50 $25.00 $12.50 Dec Mar Jun Sep Dec Mar Jun Sep Dec Mar Jun 2014 2015 2016 $29.49, Sep 16 10:20 am$29.69, Nov 19 - Dec 8$29.16, Dec 10 - Oct 5$29.16, Dec 10 - Oct 5$19.45, May 4 - May 5$0.98, May 3 - May 7$29.16, Dec 10 - Oct 5$19.65, May 6 - May 10$0.98, May 3 - May 7$29.16, Dec 10 - Oct 5$19.65, May 6 - May 10$0.99, May 8 - May 10$29.16, Dec 10 - Oct 5$19.75, May 11 - May 13$1.00, May 10 - May 14$29.16, Dec 10 - Oct 5$19.85, May 14 3:26 am$1.00, May 10 - May 14$29.16, Dec 10 - Oct 5$19.85, May 18 - May 23$0.91, May 18 11:42 pm$29.16, Dec 10 - Oct 5$19.85, May 18 - May 23$0.88, May 21 3:58 am$29.16, Dec 10 - Oct 5$19.85, May 18 - May 23$0.87, May 21 - May 23$29.16, Dec 10 - Oct 5$19.75, May 26 - May 28$0.78, May 26 4:50 am$29.16, Dec 10 - Oct 5$19.75, May 26 - May 28$0.70, May 28 6:46 am$29.16, Dec 10 - Oct 5$19.75, May 30 - Jun 3$0.62, May 30 8:48 pm$29.16, Dec 10 - Oct 5$19.75, May 30 - Jun 3$0.58, Jun 2 1:44 pm$29.16, Dec 10 - Oct 5$19.65, Jun 3 - Jun 8$0.49, Jun 5 - Jun 8$29.16, Dec 10 - Oct 5$19.70, Jun 9 1:01 pm$0.48, Jun 9 1:01 pm$29.16, Dec 10 - Oct 5$19.65, Jun 11 - Jun 15$0.38, Jun 11 11:36 pm$29.16, Dec 10 - Oct 5$19.65, Jun 11 - Jun 15$0.29, Jun 14 3:23 am$29.16, Dec 10 - Oct 5$19.70, Jun 17 3:19 am$0.18, Jun 17 3:19 am$29.16, Dec 10 - Oct 5$19.95, Jun 18 - Jun 25$0.12, Jun 19 9:12 am$29.16, Dec 10 - Oct 5$19.95, Jun 18 - Jun 25$0.05, Jun 21 3:35 pm$29.16, Dec 10 - Oct 5$19.95, Jun 18 - Jun 25$0.01, Jun 23 - Jul 26$29.16, Dec 10 - Oct 5$19.55, Jun 28 - Jun 30$0.01, Jun 23 - Jul 26$29.16, Dec 10 - Oct 5$19.56, Jul 1 - Jul 2$0.01, Jun 23 - Jul 26$29.16, Dec 10 - Oct 5$19.55, Jul 5 9:30 pm$0.01, Jun 23 - Jul 26$29.16, Dec 10 - Oct 5$19.75, Jul 8 2:16 pm$0.01, Jun 23 - Jul 26$29.16, Dec 10 - Oct 5$19.04, Jul 11 3:27 am$0.01, Jun 23 - Jul 26$29.16, Dec 10 - Oct 5$18.96, Jul 13 10:53 pm$0.01, Jun 23 - Jul 26$29.16, Dec 10 - Oct 5$18.56, Jul 15 4:26 am$0.01, Jun 23 - Jul 26$29.16, Dec 10 - Oct 5$18.20, Jul 18 2:23 am$0.01, Jun 23 - Jul 26$29.16, Dec 10 - Oct 5$18.22, Jul 21 7:13 am$0.01, Jun 23 - Jul 26$29.16, Dec 10 - Oct 5$18.21, Jul 22 - Jul 23$0.01, Jun 23 - Jul 26$29.16, Dec 10 - Oct 5$17.47, Jul 26 3:37 am$0.01, Jun 23 - Jul 26$29.16, Dec 10 - Oct 5$17.42, Jul 26 - Jul 28$0.25, Jul 26 - Jul 28$29.16, Dec 10 - Oct 5$16.67, Jul 30 - Jul 31$0.99, Jul 29 - Aug 3$29.16, Dec 10 - Oct 5$16.25, Aug 2 11:22 am$0.99, Jul 29 - Aug 3$29.16, Dec 10 - Oct 5$16.25, Aug 4 9:33 am$1.00, Aug 4 - Aug 12$29.16, Dec 10 - Oct 5$15.56, Aug 7 7:13 am$1.00, Aug 4 - Aug 12$29.16, Dec 10 - Oct 5$15.22, Aug 9 - Aug 10$1.00, Aug 4 - Aug 12$29.16, Dec 10 - Oct 5$15.21, Aug 11 9:34 am$1.00, Aug 4 - Aug 12$29.16, Dec 10 - Oct 5$14.41, Aug 14 6:52 am$0.99, Aug 13 - Aug 22$29.16, Dec 10 - Oct 5$14.06, Aug 16 3:30 am$0.99, Aug 13 - Aug 22$29.16, Dec 10 - Oct 5$13.62, Aug 19 10:21 am$0.99, Aug 13 - Aug 22$29.16, Dec 10 - Oct 5$13.24, Aug 21 12:41 pm$0.99, Aug 13 - Aug 22$29.16, Dec 10 - Oct 5$13.22, Aug 23 12:46 pm$0.95, Aug 23 12:46 pm$29.16, Dec 10 - Oct 5$12.84, Aug 26 4:57 pm$0.71, Aug 26 4:57 pm$29.16, Dec 10 - Oct 5$12.39, Aug 28 9:41 pm$0.53, Aug 28 9:41 pm$29.16, Dec 10 - Oct 5$11.99, Aug 31 5:11 am$0.41, Aug 31 5:11 am$29.16, Dec 10 - Oct 5$11.64, Sep 2 12:30 pm$0.15, Sep 2 12:30 pm$29.16, Dec 10 - Oct 5$10.97, Sep 4 9:13 pm$0.01, Sep 4 - Sep 18$29.16, Dec 10 - Oct 5$10.58, Sep 7 5:58 am$0.01, Sep 4 - Sep 18$29.16, Dec 10 - Oct 5$10.62, Sep 9 6:52 pm$0.01, Sep 4 - Sep 18$29.16, Dec 10 - Oct 5$10.22, Sep 12 - Sep 16$0.01, Sep 4 - Sep 18$29.16, Dec 10 - Oct 5$9.04, Sep 19 10:48 am$1.00, Sep 19 - Sep 29$29.16, Dec 10 - Oct 5$8.67, Sep 22 9:39 am$1.00, Sep 19 - Sep 29$29.16, Dec 10 - Oct 5$8.37, Sep 24 - Sep 25$1.00, Sep 19 - Sep 29$29.16, Dec 10 - Oct 5$8.21, Sep 27 - Sep 29$1.00, Sep 19 - Sep 29$29.16, Dec 10 - Oct 5$8.16, Oct 1 3:26 pm$1.70, Oct 1 - Oct 3$29.16, Dec 10 - Oct 5$8.15, Oct 2 - Oct 8$1.70, Oct 1 - Oct 3$29.16, Dec 10 - Oct 5$8.15, Oct 2 - Oct 8$1.55, Oct 5 9:52 pm$26.67, Oct 8 - Oct 10$8.15, Oct 2 - Oct 8$1.25, Oct 8 2:29 am$26.67, Oct 8 - Oct 10$8.16, Oct 10 7:14 am$1.75, Oct 10 - Oct 16$29.16, Oct 12 - Dec 4$8.12, Oct 14 11:10 am$1.75, Oct 10 - Oct 16$29.16, Oct 12 - Dec 4$8.26, Oct 16 2:36 pm$1.75, Oct 10 - Oct 16$29.16, Oct 12 - Dec 4$8.25, Oct 18 6:30 pm$1.63, Oct 18 6:30 pm$29.16, Oct 12 - Dec 4$8.19, Oct 21 2:16 am$1.21, Oct 21 2:16 am$29.16, Oct 12 - Dec 4$8.51, Oct 23 8:40 am$1.01, Oct 23 8:40 am$29.16, Oct 12 - Dec 4$8.17, Oct 28 3:11 pm$0.67, Oct 28 3:11 pm$29.16, Oct 12 - Dec 4$8.26, Nov 2 - Nov 9$0.46, Nov 2 11:29 pm$29.16, Oct 12 - Dec 4$8.26, Nov 2 - Nov 9$0.01, Nov 9 - Nov 22$29.16, Oct 12 - Dec 4$8.16, Nov 14 11:04 pm$0.01, Nov 9 - Nov 22$29.16, Oct 12 - Dec 4$8.21, Nov 18 7:23 am$0.01, Nov 9 - Nov 22$29.16, Oct 12 - Dec 4$8.16, Nov 20 2:00 pm$0.01, Nov 9 - Nov 22$29.16, Oct 12 - Dec 4$8.11, Nov 22 - Nov 30$1.67, Nov 24 6:47 pm$29.16, Oct 12 - Dec 4$8.11, Nov 22 - Nov 30$1.55, Nov 26 5:29 pm$29.16, Oct 12 - Dec 4$8.11, Nov 22 - Nov 30$0.25, Nov 28 - Dec 6$29.16, Oct 12 - Dec 4$8.12, Dec 4 - Dec 6$0.25, Nov 28 - Dec 6$29.01, Dec 6 - Dec 12$8.12, Dec 4 - Dec 6$0.25, Nov 28 - Dec 6$29.01, Dec 6 - Dec 12$8.16, Dec 8 9:01 am$0.50, Dec 8 - Dec 17$29.01, Dec 6 - Dec 12$8.11, Dec 10 3:38 pm$0.50, Dec 8 - Dec 17$29.01, Dec 6 - Dec 12$8.16, Dec 12 12:21 pm$0.50, Dec 8 - Dec 17$29.16, Dec 14 - Apr 4$8.16, Dec 16 10:07 am$0.50, Dec 8 - Dec 17$29.16, Dec 14 - Apr 4$8.11, Dec 17 - Dec 23$0.50, Dec 8 - Dec 17$29.16, Dec 14 - Apr 4$8.11, Dec 17 - Dec 23$0.46, Dec 23 7:51 am$29.16, Dec 14 - Apr 4$8.06, Dec 26 6:12 am$0.24, Dec 26 6:12 am$29.16, Dec 14 - Apr 4$8.11, Dec 27 - Dec 31$0.16, Dec 27 1:21 pm$29.16, Dec 14 - Apr 4$8.11, Dec 27 - Dec 31$0.06, Dec 30 7:13 pm$29.16, Dec 14 - Apr 4$8.16, Jan 2 - Jan 6$0.01, Jan 2 - Jan 8$29.16, Dec 14 - Apr 4$8.11, Jan 7 4:32 am$0.01, Jan 2 - Jan 8$29.16, Dec 14 - Apr 4$8.12, Jan 8 - Jan 9$0.40, Jan 9 - Jan 11$29.16, Dec 14 - Apr 4$8.16, Jan 11 4:49 pm$0.40, Jan 9 - Jan 11$29.16, Dec 14 - Apr 4$15.48, Jan 14 - Jan 16$1.18, Jan 14 7:39 pm$29.16, Dec 14 - Apr 4$15.48, Jan 14 - Jan 16$1.31, Jan 16 10:00 am$29.16, Dec 14 - Apr 4$15.44, Jan 19 12:11 am$0.91, Jan 19 12:11 am$29.16, Dec 14 - Apr 4$15.21, Jan 20 3:33 pm$0.84, Jan 20 3:33 pm$29.16, Dec 14 - Apr 4$14.49, Jan 23 8:30 pm$1.60, Jan 23 8:30 pm$29.16, Dec 14 - Apr 4$15.06, Jan 25 12:09 pm$0.43, Jan 25 12:09 pm$29.16, Dec 14 - Apr 4$15.10, Jan 28 10:29 pm$1.74, Jan 28 10:29 pm$29.16, Dec 14 - Apr 4$14.75, Jan 31 - Feb 2$1.74, Jan 31 - Feb 2$29.16, Dec 14 - Apr 4$14.36, Feb 4 3:02 am$1.75, Feb 4 - Feb 11$29.16, Dec 14 - Apr 4$13.96, Feb 7 3:20 pm$1.75, Feb 4 - Feb 11$29.16, Dec 14 - Apr 4$14.06, Feb 9 10:48 am$1.75, Feb 4 - Feb 11$29.16, Dec 14 - Apr 4$13.66, Feb 13 1:37 am$1.74, Feb 13 - Mar 7$29.16, Dec 14 - Apr 4$13.46, Feb 14 9:24 pm$1.74, Feb 13 - Mar 7$29.16, Dec 14 - Apr 4$13.11, Feb 16 9:44 pm$1.74, Feb 13 - Mar 7$29.16, Dec 14 - Apr 4$13.21, Feb 18 5:55 pm$1.74, Feb 13 - Mar 7$29.16, Dec 14 - Apr 4$12.81, Feb 21 - Feb 23$1.74, Feb 13 - Mar 7$29.16, Dec 14 - Apr 4$12.76, Feb 25 - Feb 27$1.74, Feb 13 - Mar 7$29.16, Dec 14 - Apr 4$12.46, Mar 1 - Mar 3$1.74, Feb 13 - Mar 7$29.16, Dec 14 - Apr 4$11.83, Mar 5 4:14 pm$1.74, Feb 13 - Mar 7$29.16, Dec 14 - Apr 4$11.78, Mar 7 - Mar 9$1.74, Feb 13 - Mar 7$29.16, Dec 14 - Apr 4$11.78, Mar 7 - Mar 9$1.72, Mar 9 6:40 pm$29.16, Dec 14 - Apr 4$11.70, Mar 12 3:53 am$0.98, Mar 12 3:53 am$29.16, Dec 14 - Apr 4$11.63, Mar 14 10:55 am$0.76, Mar 14 10:55 am$29.16, Dec 14 - Apr 4$11.13, Mar 17 9:16 am$0.26, Mar 17 9:16 am$29.16, Dec 14 - Apr 4$10.53, Mar 19 3:00 pm$1.17, Mar 19 3:00 pm$29.16, Dec 14 - Apr 4$10.28, Mar 23 1:30 am$1.19, Mar 21 - Mar 23$29.16, Dec 14 - Apr 4$9.83, Mar 25 - Mar 27$1.23, Mar 25 8:25 am$29.16, Dec 14 - Apr 4$9.83, Mar 25 - Mar 27$1.75, Mar 27 - Apr 6$29.16, Dec 14 - Apr 4$9.53, Mar 30 1:28 am$1.75, Mar 27 - Apr 6$29.16, Dec 14 - Apr 4$9.23, Apr 1 11:23 am$1.75, Mar 27 - Apr 6$29.16, Dec 14 - Apr 4$8.93, Apr 4 3:34 am$1.75, Mar 27 - Apr 6$29.59, Apr 6 - Apr 12$8.98, Apr 6 6:50 pm$1.75, Mar 27 - Apr 6$29.59, Apr 6 - Apr 12$8.68, Apr 8 3:20 am$3.98, Apr 8 - Apr 15$29.59, Apr 6 - Apr 12$8.41, Apr 10 - Apr 12$3.98, Apr 8 - Apr 15$29.88, Apr 15 - Apr 17$8.16, Apr 15 5:50 am$3.98, Apr 8 - Apr 15$29.88, Apr 15 - Apr 17$8.26, Apr 17 6:22 pm$3.91, Apr 17 6:22 pm$30.18, Apr 20 - Apr 23$8.25, Apr 20 8:11 am$3.81, Apr 20 8:11 am$30.18, Apr 20 - Apr 23$8.04, Apr 23 2:42 am$3.70, Apr 23 2:42 am$30.58, Apr 26 - May 2$7.94, Apr 26 - Apr 29$3.35, Apr 26 6:57 am$30.58, Apr 26 - May 2$7.94, Apr 26 - Apr 29$2.39, Apr 29 6:03 am$30.58, Apr 26 - May 2$7.63, May 2 12:53 am$1.82, May 2 12:53 am$30.67, May 4 - Jun 25$6.99, May 4 2:55 pm$1.34, May 4 2:55 pm$30.67, May 4 - Jun 25$5.92, May 7 10:24 pm$2.42, May 7 10:24 pm$30.67, May 4 - Jun 25$5.24, May 11 12:53 pm$3.65, May 11 12:53 pm$30.67, May 4 - Jun 25$7.20, May 14 7:33 pm$4.29, May 14 7:33 pm$30.67, May 4 - Jun 25$7.19, May 19 12:35 am$3.92, May 19 12:35 am$30.67, May 4 - Jun 25$7.99, May 23 5:01 am$7.11, May 23 5:01 am$30.67, May 4 - Jun 25$7.87, May 27 12:06 pm$6.40, May 27 12:06 pm$30.67, May 4 - Jun 25$8.24, Jun 1 - Jun 5$6.24, Jun 1 2:53 am$30.67, May 4 - Jun 25$8.24, Jun 1 - Jun 5$6.13, Jun 5 5:38 pm$30.67, May 4 - Jun 25$8.49, Jun 9 - Jun 13$5.55, Jun 9 11:38 pm$30.67, May 4 - Jun 25$8.49, Jun 9 - Jun 13$3.99, Jun 13 8:33 pm$30.67, May 4 - Jun 25$11.54, Jun 17 1:20 pm$5.86, Jun 17 1:20 pm$30.67, May 4 - Jun 25$14.80, Jun 21 8:47 am$2.98, Jun 21 8:47 am$30.67, May 4 - Jun 25$18.31, Jun 25 3:38 am$2.16, Jun 25 3:38 am$28.51, Jun 29 - Jul 3$22.04, Jun 29 6:10 am$3.91, Jun 29 6:10 am$28.51, Jun 29 - Jul 3$21.98, Jul 3 11:11 am$2.75, Jul 3 11:11 am$24.58, Jul 7 - Jul 23$21.77, Jul 7 4:36 pm$2.07, Jul 7 4:36 pm$24.58, Jul 7 - Jul 23$21.53, Jul 13 1:14 am$2.99, Jul 13 - Jul 20$24.58, Jul 7 - Jul 23$20.10, Jul 16 5:15 pm$2.99, Jul 13 - Jul 20$24.58, Jul 7 - Jul 23$19.91, Jul 20 8:03 am$2.99, Jul 13 - Jul 20$24.58, Jul 7 - Jul 23$19.86, Jul 23 9:13 pm$3.00, Jul 23 - Jul 27$24.10, Jul 27 - Jul 31$19.85, Jul 27 10:31 am$3.00, Jul 23 - Jul 27$24.10, Jul 27 - Jul 31$19.89, Jul 31 1:26 am$3.99, Jul 31 1:26 am$22.66, Aug 3 - Aug 14$19.91, Aug 3 2:53 pm$3.89, Aug 3 2:53 pm$22.66, Aug 3 - Aug 14$19.93, Aug 7 - Aug 22$3.70, Aug 7 - Aug 11$22.66, Aug 3 - Aug 14$19.93, Aug 7 - Aug 22$3.79, Aug 14 9:36 pm$23.57, Aug 18 - Aug 22$19.93, Aug 7 - Aug 22$3.65, Aug 18 2:51 pm$23.57, Aug 18 - Aug 22$19.93, Aug 7 - Aug 22$3.93, Aug 22 8:51 am$25.68, Aug 26 - Aug 29$10.00, Aug 26 3:19 am$3.58, Aug 26 3:19 am$25.68, Aug 26 - Aug 29$16.90, Aug 29 - Sep 2$3.23, Aug 29 9:40 pm$25.82, Sep 2 - Sep 6$16.90, Aug 29 - Sep 2$2.92, Sep 2 4:07 pm$25.82, Sep 2 - Sep 6$19.18, Sep 6 2:06 pm$2.85, Sep 6 2:06 pm$25.68, Sep 10 - Sep 22$19.85, Sep 10 11:57 am$2.64, Sep 10 11:57 am$25.68, Sep 10 - Sep 22$19.91, Sep 14 8:13 am$2.47, Sep 14 8:13 am$25.68, Sep 10 - Sep 22$19.93, Sep 18 - Oct 14$2.35, Sep 18 5:10 am$25.68, Sep 10 - Sep 22$19.93, Sep 18 - Oct 14$2.21, Sep 22 3:20 am$25.82, Sep 26 - Oct 4$19.93, Sep 18 - Oct 14$1.84, Sep 26 1:43 am$25.82, Sep 26 - Oct 4$19.93, Sep 18 - Oct 14$1.63, Sep 30 12:33 am$25.82, Sep 26 - Oct 4$19.93, Sep 18 - Oct 14$1.75, Oct 4 2:15 am$25.96, Oct 8 - Oct 10$19.93, Sep 18 - Oct 14$1.74, Oct 8 - Oct 20$26.10, Oct 14 - Oct 16$19.93, Sep 18 - Oct 14$1.74, Oct 8 - Oct 20$26.10, Oct 14 - Oct 16$20.31, Oct 16 7:48 am$1.74, Oct 8 - Oct 20$26.23, Oct 20 - Oct 24$20.03, Oct 20 4:38 am$1.74, Oct 8 - Oct 20$26.23, Oct 20 - Oct 24$19.97, Oct 24 1:56 am$1.72, Oct 24 1:56 am$26.36, Oct 28 - Nov 1$20.32, Oct 28 12:05 am$1.69, Oct 28 12:05 am$26.36, Oct 28 - Nov 1$19.99, Nov 1 12:08 am$1.66, Nov 1 12:08 am$26.49, Nov 5 - Nov 9$19.98, Nov 5 12:26 am$1.63, Nov 5 12:26 am$26.49, Nov 5 - Nov 9$19.97, Nov 9 3:00 am$1.60, Nov 9 3:00 am$26.62, Nov 11 - Nov 15$19.98, Nov 11 5:17 am$1.58, Nov 11 5:17 am$26.62, Nov 11 - Nov 15$19.97, Nov 15 - Nov 19$1.55, Nov 15 8:43 am$27.15, Nov 19 - Nov 26$19.97, Nov 15 - Nov 19$1.75, Nov 19 - Dec 11$27.15, Nov 19 - Nov 26$19.96, Nov 21 11:32 pm$1.75, Nov 19 - Dec 11$27.15, Nov 19 - Nov 26$19.98, Nov 26 10:03 am$1.75, Nov 19 - Dec 11$27.67, Dec 1 - Dec 6$19.96, Dec 1 6:27 am$1.75, Nov 19 - Dec 11$27.67, Dec 1 - Dec 6$20.15, Dec 6 3:43 am$1.75, Nov 19 - Dec 11$28.19, Dec 11 6:18 am$20.11, Dec 11 6:18 am$1.75, Nov 19 - Dec 11$28.70, Dec 16 - Dec 26$20.09, Dec 16 7:35 am$1.69, Dec 16 7:35 am$28.70, Dec 16 - Dec 26$20.07, Dec 21 5:28 am$1.54, Dec 21 5:28 am$28.70, Dec 16 - Dec 26$20.04, Dec 26 6:54 pm$1.66, Dec 26 6:54 pm$29.21, Dec 31 10:29 am$20.02, Dec 31 10:29 am$1.55, Dec 31 10:29 am$29.71, Jan 5 - Jan 10$20.00, Jan 5 4:14 am$2.42, Jan 5 4:14 am$29.71, Jan 5 - Jan 10$19.98, Jan 10 - Jan 30$1.75, Jan 10 - Jan 20$30.21, Jan 14 - Jan 20$19.98, Jan 10 - Jan 30$1.75, Jan 10 - Jan 20$30.70, Jan 25 - Jan 30$19.98, Jan 10 - Jan 30$1.76, Jan 25 - Feb 4$31.19, Feb 4 2:30 am$18.99, Feb 4 - Mar 29$1.76, Jan 25 - Feb 4$30.65, Feb 9 4:19 am$18.99, Feb 4 - Mar 29$1.75, Feb 9 - Feb 14$31.23, Feb 14 - Mar 6$18.99, Feb 4 - Mar 29$1.75, Feb 9 - Feb 14$31.23, Feb 14 - Mar 6$18.99, Feb 4 - Mar 29$1.76, Feb 19 - Mar 6$31.22, Mar 17 6:24 pm$18.99, Feb 4 - Mar 29$2.50, Mar 17 6:24 pm$29.77, Mar 29 7:32 am$18.99, Feb 4 - Mar 29$2.49, Mar 29 7:32 am 81,2491,311,211 1,562,500 1,171,875 781,250 390,625 Oct Dec Feb Apr Jun Aug Oct Dec Feb Apr 2015 2016

Price Details

New

Last Seen $29.77 Mar 29, '16
Highest $31.23 Feb 14, '16
Lowest $22.66 Aug 3, '15
Average $31.23 (30d avg)
$30.74 (90d avg)
$28.86 (180d avg)
$28.23 (365d avg)
$28.81 (Lifetime average)
Added Sep 16, 2013

3rd Party New

Last Seen $18.99 Mar 29, '16
Highest $22.04 Jun 29, '15
Lowest $3.92 May 19, '15
Average $18.99 (30d avg)
$19.38 (90d avg)
$19.71 (180d avg)
$16.94 (365d avg)
$15.05 (Lifetime average)
Added Sep 16, 2013

3rd Party Used

Last Seen $2.49 Mar 29, '16
Highest $7.20 May 14, '15
Lowest $0.01 Jan 2, '15
Average $2.04 (30d avg)
$1.88 (90d avg)
$1.79 (180d avg)
$2.73 (365d avg)
$1.80 (Lifetime average)
Added Sep 16, 2013

Sales Rank

30 day average: 379,550
90 day average: 890,130

Product Description

What do Amazon's product reviews, eBay's feedback score system, Slashdot's Karma System, and Xbox Live's Achievements have in common? They're all examples of successful reputation systems that enable consumer websites to manage and present user contributions most effectively. This book shows you how to design and develop reputation systems for your own sites or web applications, written by experts who have designed web communities for Yahoo! and other prominent sites. helps you ask the hard questions about these underlying mechanisms, and why they're critical for any organization that draws from or depends on user-generated content. It's a must-have for system architects, product managers, community support staff, and UI designers.

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