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Buy from Amazon $37.47$4.50 $40.00 $30.00 $20.00 $10.00 $0.00 Dec Mar Jun Sep Dec Mar Jun Sep Dec Mar Jun 2014 2015 2016 $33.07, Sep 16 10:08 pm$33.18, Nov 19 - Dec 16$33.29, Dec 18 - Dec 29$33.40, Dec 30 - Jan 17$33.51, Jan 17 - Feb 7$33.52, Feb 8 - Sep 6$33.52, Feb 8 - Sep 6$24.19, May 2 - May 7$7.00, May 4 - May 19$33.52, Feb 8 - Sep 6$24.17, May 8 - May 12$7.00, May 4 - May 19$33.52, Feb 8 - Sep 6$24.16, May 13 - May 23$7.00, May 4 - May 19$33.52, Feb 8 - Sep 6$24.16, May 13 - May 23$6.93, May 22 2:24 am$33.52, Feb 8 - Sep 6$24.00, May 23 - Jul 2$6.59, May 24 3:40 pm$33.52, Feb 8 - Sep 6$24.00, May 23 - Jul 2$6.24, May 27 3:28 am$33.52, Feb 8 - Sep 6$24.00, May 23 - Jul 2$7.96, May 29 - May 30$33.52, Feb 8 - Sep 6$24.00, May 23 - Jul 2$7.98, May 31 - Jun 1$33.52, Feb 8 - Sep 6$24.00, May 23 - Jul 2$7.99, Jun 2 - Jun 9$33.52, Feb 8 - Sep 6$24.00, May 23 - Jul 2$9.00, Jun 9 - Jun 26$33.52, Feb 8 - Sep 6$24.00, May 23 - Jul 2$8.80, Jun 27 - Jul 1$33.52, Feb 8 - Sep 6$24.00, May 23 - Jul 2$8.79, Jul 2 - Jul 7$33.52, Feb 8 - Sep 6$23.99, Jul 4 - Aug 7$8.79, Jul 2 - Jul 7$33.52, Feb 8 - Sep 6$23.99, Jul 4 - Aug 7$8.78, Jul 9 - Jul 10$33.52, Feb 8 - Sep 6$23.99, Jul 4 - Aug 7$8.74, Jul 12 8:45 pm$33.52, Feb 8 - Sep 6$23.99, Jul 4 - Aug 7$8.78, Jul 15 - Jul 18$33.52, Feb 8 - Sep 6$23.99, Jul 4 - Aug 7$8.76, Jul 20 11:37 am$33.52, Feb 8 - Sep 6$23.99, Jul 4 - Aug 7$8.72, Jul 22 6:52 pm$33.52, Feb 8 - Sep 6$23.99, Jul 4 - Aug 7$8.67, Jul 25 11:33 am$33.52, Feb 8 - Sep 6$23.99, Jul 4 - Aug 7$8.76, Aug 1 3:59 pm$33.52, Feb 8 - Sep 6$23.99, Jul 4 - Aug 7$8.74, Aug 2 - Aug 3$33.52, Feb 8 - Sep 6$23.99, Jul 4 - Aug 7$8.72, Aug 6 - Aug 8$33.52, Feb 8 - Sep 6$23.97, Aug 8 - Aug 15$8.72, Aug 6 - Aug 8$33.52, Feb 8 - Sep 6$23.97, Aug 8 - Aug 15$8.68, Aug 11 12:30 pm$33.52, Feb 8 - Sep 6$23.97, Aug 8 - Aug 15$8.65, Aug 13 10:58 am$33.52, Feb 8 - Sep 6$23.99, Aug 16 - Sep 3$8.73, Aug 16 - Aug 18$33.52, Feb 8 - Sep 6$23.99, Aug 16 - Sep 3$17.49, Aug 19 - Aug 22$33.52, Feb 8 - Sep 6$23.99, Aug 16 - Sep 3$16.95, Aug 23 - Aug 26$33.52, Feb 8 - Sep 6$23.99, Aug 16 - Sep 3$19.55, Aug 28 - Aug 29$33.52, Feb 8 - Sep 6$23.99, Aug 16 - Sep 3$20.00, Aug 30 - Sep 1$33.52, Feb 8 - Sep 6$23.99, Aug 16 - Sep 3$20.59, Sep 3 11:52 pm$33.52, Feb 8 - Sep 6$23.91, Sep 6 5:41 am$22.50, Sep 6 5:41 am$33.28, Sep 8 - Sep 14$23.59, Sep 8 11:23 am$22.28, Sep 8 11:23 am$33.28, Sep 8 - Sep 14$23.28, Sep 10 5:42 pm$20.59, Sep 10 5:42 pm$33.28, Sep 8 - Sep 14$22.70, Sep 14 10:15 pm$19.05, Sep 14 10:15 pm$33.04, Sep 19 - Sep 23$25.18, Sep 19 - Oct 18$16.09, Sep 19 1:37 am$33.04, Sep 19 - Sep 23$25.18, Sep 19 - Oct 18$15.14, Sep 21 - Sep 23$32.80, Sep 25 - Sep 29$25.18, Sep 19 - Oct 18$15.12, Sep 25 7:06 pm$32.80, Sep 25 - Sep 29$25.18, Sep 19 - Oct 18$14.99, Sep 29 10:13 pm$32.56, Oct 2 - Oct 6$25.18, Sep 19 - Oct 18$11.96, Oct 2 1:14 am$32.56, Oct 2 - Oct 6$25.18, Sep 19 - Oct 18$8.98, Oct 4 3:12 am$32.56, Oct 2 - Oct 6$25.18, Sep 19 - Oct 18$8.42, Oct 6 4:57 am$32.33, Oct 8 - Oct 12$25.18, Sep 19 - Oct 18$4.73, Oct 8 6:59 am$32.33, Oct 8 - Oct 12$25.18, Sep 19 - Oct 18$5.94, Oct 10 10:18 am$32.10, Oct 14 - Oct 21$25.18, Sep 19 - Oct 18$6.01, Oct 14 2:04 pm$32.10, Oct 14 - Oct 21$25.18, Sep 19 - Oct 18$4.68, Oct 16 - Oct 21$32.10, Oct 14 - Oct 21$25.17, Oct 21 12:45 am$4.68, Oct 16 - Oct 21$32.74, Oct 23 - Nov 3$25.15, Oct 23 8:08 am$4.84, Oct 23 8:08 am$32.74, Oct 23 - Nov 3$25.10, Oct 28 2:45 pm$5.01, Oct 28 - Nov 3$32.74, Oct 23 - Nov 3$25.08, Nov 3 - Jan 7$5.01, Oct 28 - Nov 3$33.29, Nov 9 - Dec 4$25.08, Nov 3 - Jan 7$5.26, Nov 9 3:06 pm$33.29, Nov 9 - Dec 4$25.08, Nov 3 - Jan 7$5.00, Nov 15 3:42 am$33.29, Nov 9 - Dec 4$25.08, Nov 3 - Jan 7$7.13, Nov 18 - Nov 20$33.29, Nov 9 - Dec 4$25.08, Nov 3 - Jan 7$6.99, Nov 22 - Nov 28$33.29, Nov 9 - Dec 4$25.08, Nov 3 - Jan 7$6.45, Nov 30 4:49 pm$33.29, Nov 9 - Dec 4$25.08, Nov 3 - Jan 7$6.37, Dec 2 - Dec 4$33.12, Dec 6 - Dec 10$25.08, Nov 3 - Jan 7$6.54, Dec 6 - Dec 10$33.45, Dec 12 - Dec 17$25.08, Nov 3 - Jan 7$5.58, Dec 12 4:42 pm$33.45, Dec 12 - Dec 17$25.08, Nov 3 - Jan 7$6.54, Dec 14 - Dec 15$33.45, Dec 12 - Dec 17$25.08, Nov 3 - Jan 7$6.46, Dec 17 1:49 pm$33.52, Dec 22 - Apr 24$25.08, Nov 3 - Jan 7$6.54, Dec 22 - Jan 4$33.52, Dec 22 - Apr 24$25.08, Nov 3 - Jan 7$6.09, Jan 6 2:18 pm$33.52, Dec 22 - Apr 24$25.03, Jan 8 10:51 pm$5.69, Jan 8 10:51 pm$33.52, Dec 22 - Apr 24$24.73, Jan 11 5:11 am$6.54, Jan 11 - Jan 12$33.52, Dec 22 - Apr 24$24.57, Jan 12 2:00 pm$6.54, Jan 11 - Jan 12$33.52, Dec 22 - Apr 24$25.08, Jan 15 - Jan 29$12.23, Jan 15 8:13 pm$33.52, Dec 22 - Apr 24$25.08, Jan 15 - Jan 29$11.52, Jan 18 8:27 am$33.52, Dec 22 - Apr 24$25.08, Jan 15 - Jan 29$11.29, Jan 20 12:49 am$33.52, Dec 22 - Apr 24$25.08, Jan 15 - Jan 29$10.95, Jan 23 5:02 am$33.52, Dec 22 - Apr 24$25.08, Jan 15 - Jan 29$10.75, Jan 24 7:53 pm$33.52, Dec 22 - Apr 24$25.08, Jan 15 - Jan 29$10.35, Jan 28 5:44 am$33.52, Dec 22 - Apr 24$25.08, Jan 15 - Jan 29$10.15, Jan 29 11:10 pm$33.52, Dec 22 - Apr 24$24.52, Feb 2 12:58 pm$9.61, Feb 2 12:58 pm$33.52, Dec 22 - Apr 24$24.16, Feb 4 8:55 am$9.30, Feb 4 8:55 am$33.52, Dec 22 - Apr 24$23.80, Feb 6 2:56 am$9.03, Feb 6 2:56 am$33.52, Dec 22 - Apr 24$23.06, Feb 9 4:54 pm$8.64, Feb 9 4:54 pm$33.52, Dec 22 - Apr 24$22.69, Feb 11 12:11 pm$8.48, Feb 11 12:11 pm$33.52, Dec 22 - Apr 24$22.34, Feb 13 7:32 am$8.39, Feb 13 7:32 am$33.52, Dec 22 - Apr 24$21.53, Feb 17 3:44 am$8.37, Feb 17 3:44 am$33.52, Dec 22 - Apr 24$21.05, Feb 19 12:36 am$9.98, Feb 19 12:36 am$33.52, Dec 22 - Apr 24$20.76, Feb 20 10:03 pm$8.36, Feb 20 10:03 pm$33.52, Dec 22 - Apr 24$19.99, Feb 24 5:40 pm$7.99, Feb 24 5:40 pm$33.52, Dec 22 - Apr 24$19.67, Feb 26 3:24 pm$8.00, Feb 26 - Mar 1$33.52, Dec 22 - Apr 24$24.88, Mar 1 1:26 pm$8.00, Feb 26 - Mar 1$33.52, Dec 22 - Apr 24$25.07, Mar 3 - Mar 14$7.99, Mar 3 5:25 pm$33.52, Dec 22 - Apr 24$25.07, Mar 3 - Mar 14$7.90, Mar 5 9:47 pm$33.52, Dec 22 - Apr 24$25.07, Mar 3 - Mar 14$7.95, Mar 7 9:43 pm$33.52, Dec 22 - Apr 24$25.07, Mar 3 - Mar 14$7.99, Mar 10 - Mar 14$33.52, Dec 22 - Apr 24$24.97, Mar 18 2:49 pm$7.60, Mar 17 - Mar 24$33.52, Dec 22 - Apr 24$24.93, Mar 20 - Mar 23$7.60, Mar 17 - Mar 24$33.52, Dec 22 - Apr 24$24.90, Mar 24 - Mar 26$11.99, Mar 25 - Mar 29$33.52, Dec 22 - Apr 24$25.07, Mar 27 - Mar 29$11.99, Mar 25 - Mar 29$33.52, Dec 22 - Apr 24$25.02, Mar 31 12:07 pm$7.99, Mar 31 - Apr 3$33.52, Dec 22 - Apr 24$24.87, Apr 3 3:49 am$7.99, Mar 31 - Apr 3$33.52, Dec 22 - Apr 24$24.84, Apr 5 6:15 pm$11.95, Apr 5 - Apr 14$33.52, Dec 22 - Apr 24$24.92, Apr 8 9:25 am$11.95, Apr 5 - Apr 14$33.52, Dec 22 - Apr 24$24.84, Apr 11 9:33 am$11.95, Apr 5 - Apr 14$33.52, Dec 22 - Apr 24$24.77, Apr 14 3:23 am$11.95, Apr 5 - Apr 14$33.52, Dec 22 - Apr 24$24.54, Apr 16 6:22 pm$8.99, Apr 16 - Apr 19$33.52, Dec 22 - Apr 24$24.47, Apr 19 9:52 am$8.99, Apr 16 - Apr 19$33.52, Dec 22 - Apr 24$25.03, Apr 22 2:53 am$7.95, Apr 22 2:53 am$33.52, Dec 22 - Apr 24$25.07, Apr 24 11:52 pm$8.00, Apr 24 11:52 pm$33.52, Apr 27 - Jul 16$25.06, Apr 29 11:00 am$7.96, Apr 29 - May 2$33.52, Apr 27 - Jul 16$25.03, May 2 5:34 am$7.96, Apr 29 - May 2$33.52, Apr 27 - Jul 16$25.01, May 4 8:28 pm$9.99, May 4 8:28 pm$33.52, Apr 27 - Jul 16$25.00, May 8 - May 21$9.91, May 8 8:46 am$33.52, Apr 27 - Jul 16$25.00, May 8 - May 21$9.99, May 11 6:13 pm$33.52, Apr 27 - Jul 16$25.00, May 8 - May 21$9.97, May 14 10:16 pm$33.52, Apr 27 - Jul 16$25.00, May 8 - May 21$9.94, May 19 3:47 am$33.52, Apr 27 - Jul 16$25.00, May 8 - May 21$9.97, May 21 - May 25$33.52, Apr 27 - Jul 16$24.97, May 25 - Jun 1$9.97, May 21 - May 25$33.52, Apr 27 - Jul 16$24.97, May 25 - Jun 1$9.96, May 27 - May 29$33.52, Apr 27 - Jul 16$24.97, May 25 - Jun 1$9.95, Jun 1 - Jun 5$33.52, Apr 27 - Jul 16$25.03, Jun 5 - Jul 7$9.95, Jun 1 - Jun 5$33.52, Apr 27 - Jul 16$25.03, Jun 5 - Jul 7$9.87, Jun 10 4:11 am$33.52, Apr 27 - Jul 16$25.03, Jun 5 - Jul 7$9.85, Jun 14 12:38 am$33.52, Apr 27 - Jul 16$25.03, Jun 5 - Jul 7$9.79, Jun 17 6:00 pm$33.52, Apr 27 - Jul 16$25.03, Jun 5 - Jul 7$9.05, Jun 21 12:45 pm$33.52, Apr 27 - Jul 16$25.03, Jun 5 - Jul 7$7.45, Jun 25 8:11 am$33.52, Apr 27 - Jul 16$25.03, Jun 5 - Jul 7$7.05, Jun 27 6:46 am$33.52, Apr 27 - Jul 16$25.03, Jun 5 - Jul 7$7.52, Jul 1 8:12 am$33.52, Apr 27 - Jul 16$25.03, Jun 5 - Jul 7$7.74, Jul 7 6:25 pm$33.52, Apr 27 - Jul 16$25.08, Jul 13 - Jul 16$7.70, Jul 13 2:51 am$33.52, Apr 27 - Jul 16$25.08, Jul 13 - Jul 16$7.65, Jul 16 6:54 pm$34.08, Jul 20 - Jul 29$24.00, Jul 20 - Sep 1$7.29, Jul 22 6:57 am$34.08, Jul 20 - Jul 29$24.00, Jul 20 - Sep 1$7.13, Jul 25 8:09 pm$34.08, Jul 20 - Jul 29$24.00, Jul 20 - Sep 1$7.75, Jul 29 9:43 am$34.63, Aug 2 - Aug 5$24.00, Jul 20 - Sep 1$7.76, Aug 2 12:28 am$34.63, Aug 2 - Aug 5$24.00, Jul 20 - Sep 1$7.53, Aug 5 3:24 pm$34.77, Aug 9 - Nov 15$24.00, Jul 20 - Sep 1$7.75, Aug 9 10:01 am$34.77, Aug 9 - Nov 15$24.00, Jul 20 - Sep 1$7.60, Aug 13 4:08 am$34.77, Aug 9 - Nov 15$24.00, Jul 20 - Sep 1$7.15, Aug 15 1:41 am$34.77, Aug 9 - Nov 15$24.00, Jul 20 - Sep 1$6.35, Aug 18 6:52 pm$34.77, Aug 9 - Nov 15$24.00, Jul 20 - Sep 1$5.80, Aug 22 12:59 pm$34.77, Aug 9 - Nov 15$24.00, Jul 20 - Sep 1$9.74, Aug 26 7:34 am$34.77, Aug 9 - Nov 15$24.00, Jul 20 - Sep 1$9.96, Aug 28 - Sep 1$34.77, Aug 9 - Nov 15$25.08, Sep 2 - Oct 4$9.93, Sep 2 11:40 pm$34.77, Aug 9 - Nov 15$25.08, Sep 2 - Oct 4$9.79, Sep 6 9:00 pm$34.77, Aug 9 - Nov 15$25.08, Sep 2 - Oct 4$9.63, Sep 10 6:36 pm$34.77, Aug 9 - Nov 15$25.08, Sep 2 - Oct 4$9.48, Sep 14 2:50 pm$34.77, Aug 9 - Nov 15$25.08, Sep 2 - Oct 4$9.42, Sep 18 11:35 am$34.77, Aug 9 - Nov 15$25.08, Sep 2 - Oct 4$9.96, Sep 22 9:43 am$34.77, Aug 9 - Nov 15$25.08, Sep 2 - Oct 4$6.44, Sep 26 7:48 am$34.77, Aug 9 - Nov 15$25.08, Sep 2 - Oct 4$5.89, Sep 30 6:43 am$34.77, Aug 9 - Nov 15$25.08, Sep 2 - Oct 4$5.65, Oct 4 8:27 am$34.77, Aug 9 - Nov 15$25.07, Oct 6 10:36 am$5.52, Oct 6 10:36 am$34.77, Aug 9 - Nov 15$25.08, Oct 10 - Oct 14$5.48, Oct 10 - Oct 14$34.77, Aug 9 - Nov 15$24.20, Oct 18 10:02 am$5.46, Oct 18 - Oct 26$34.77, Aug 9 - Nov 15$23.16, Oct 22 - Oct 30$5.46, Oct 18 - Oct 26$34.77, Aug 9 - Nov 15$23.16, Oct 22 - Oct 30$5.42, Oct 30 3:12 am$34.77, Aug 9 - Nov 15$22.13, Nov 3 3:02 am$5.33, Nov 3 3:02 am$34.77, Aug 9 - Nov 15$23.16, Nov 7 6:11 am$5.25, Nov 7 6:11 am$34.77, Aug 9 - Nov 15$22.64, Nov 11 - Nov 15$7.07, Nov 11 9:00 am$34.77, Aug 9 - Nov 15$22.64, Nov 11 - Nov 15$9.96, Nov 15 12:41 pm$35.32, Nov 19 - Nov 22$23.16, Nov 19 - Nov 22$6.81, Nov 19 9:55 pm$35.32, Nov 19 - Nov 22$23.16, Nov 19 - Nov 22$6.57, Nov 22 3:32 am$35.86, Nov 26 - Dec 6$21.05, Nov 26 2:27 pm$6.95, Nov 26 2:27 pm$35.86, Nov 26 - Dec 6$21.62, Dec 1 10:58 am$6.69, Dec 1 10:58 am$35.86, Nov 26 - Dec 6$21.09, Dec 6 8:26 am$6.24, Dec 6 8:26 am$36.40, Dec 11 11:17 am$22.68, Dec 11 11:17 am$5.94, Dec 11 11:17 am$36.93, Dec 16 - Dec 26$22.17, Dec 16 12:24 pm$5.89, Dec 16 12:24 pm$36.93, Dec 16 - Dec 26$23.16, Dec 21 9:56 am$5.74, Dec 21 9:56 am$36.93, Dec 16 - Dec 26$22.64, Dec 26 11:21 pm$5.23, Dec 26 11:21 pm$37.47, Dec 31 - Jan 10$23.16, Dec 31 - Jan 5$7.98, Dec 31 3:15 pm$37.47, Dec 31 - Jan 10$23.16, Dec 31 - Jan 5$9.96, Jan 5 - Jan 10$37.47, Dec 31 - Jan 10$20.95, Jan 10 6:16 am$9.96, Jan 5 - Jan 10$37.09, Jan 12 - Jan 25$18.35, Jan 12 6:27 pm$6.68, Jan 12 6:27 pm$37.09, Jan 12 - Jan 25$10.99, Jan 17 6:01 pm$10.95, Jan 17 6:01 pm$37.09, Jan 12 - Jan 25$7.74, Jan 22 6:50 pm$4.50, Jan 22 6:50 pm$37.09, Jan 12 - Jan 25$21.60, Jan 25 7:52 am$9.77, Jan 25 7:52 am$36.72, Jan 27 10:11 pm$22.13, Jan 27 10:11 pm$9.75, Jan 27 10:11 pm$36.35, Feb 1 - Feb 6$23.16, Feb 1 9:26 pm$11.97, Feb 1 9:26 pm$36.35, Feb 1 - Feb 6$22.64, Feb 6 11:25 pm$16.00, Feb 6 11:25 pm$35.98, Feb 12 3:06 am$22.13, Feb 12 - Feb 20$16.50, Feb 12 3:06 am$35.61, Feb 14 - Feb 20$22.13, Feb 12 - Feb 20$15.07, Feb 14 7:48 pm$35.61, Feb 14 - Feb 20$22.13, Feb 12 - Feb 20$14.87, Feb 20 3:45 am$36.15, Feb 25 4:32 pm$22.04, Feb 25 - Apr 10$15.87, Feb 25 4:32 pm$35.78, Mar 6 11:11 pm$22.04, Feb 25 - Apr 10$9.95, Mar 6 11:11 pm$35.04, Mar 18 9:01 am$22.04, Feb 25 - Apr 10$4.84, Mar 18 9:01 am$34.97, Mar 29 9:00 pm$22.04, Feb 25 - Apr 10$7.96, Mar 29 9:00 pm$35.06, Apr 10 6:40 am$22.04, Feb 25 - Apr 10$7.93, Apr 10 6:40 am 43,4621,083,428 1,171,875 781,250 390,625 Oct Dec Feb Apr Jun Aug Oct Dec Feb Apr Jun 2015 2016

Price Details

New

Latest $35.06 1 hr ago
Highest $37.47 Dec 31, '15
Lowest $32.10 Oct 14, '14
Average $35.01 (30d avg)
$35.95 (90d avg)
$35.87 (180d avg)
$34.94 (365d avg)
$33.96 (Lifetime average)
Added Sep 16, 2013

3rd Party New

Latest $22.04 1 hr ago
Highest $25.18 Sep 19, '14
Lowest $7.74 Jan 22, '16
Average $22.04 (30d avg)
$20.90 (90d avg)
$21.83 (180d avg)
$23.32 (365d avg)
$23.84 (Lifetime average)
Added Sep 16, 2013

3rd Party Used

Latest $7.93 1 hr ago
Highest $22.50 Sep 6, '14
Lowest $4.50 Jan 22, '16
Average $6.39 (30d avg)
$10.70 (90d avg)
$8.59 (180d avg)
$8.57 (365d avg)
$8.86 (Lifetime average)
Added Sep 16, 2013

Sales Rank

30 day average: 408,079
90 day average: 377,881

Product Description

This is the must-have book for a must-know field. Today, general security knowledge is mandatory, and, if you who need to understand the fundamentals, 2nd Edition is the book to consult.

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