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Buy from Amazon $23.95$0.01 $20.00 $15.00 $10.00 $5.00 Dec Mar Jun Sep Dec Mar Jun Sep Dec Mar Jun 2014 2015 2016 $18.95, Sep 10 - Feb 18$21.80, Feb 22 - Dec 21$21.80, Feb 22 - Dec 21$15.00, May 2 - May 8$10.30, May 2 - May 4$21.80, Feb 22 - Dec 21$15.00, May 2 - May 8$14.99, May 4 - May 8$21.80, May 9 - Jul 4$21.80, Feb 22 - Dec 21$10.51, May 10 1:44 pm$21.80, May 9 - Jul 4$21.80, Feb 22 - Dec 21$10.18, May 12 10:24 pm$21.80, May 9 - Jul 4$21.80, Feb 22 - Dec 21$11.45, May 14 2:53 pm$21.80, May 9 - Jul 4$21.80, Feb 22 - Dec 21$7.08, May 17 2:12 am$21.80, May 9 - Jul 4$21.80, Feb 22 - Dec 21$6.47, May 19 - May 23$21.80, May 9 - Jul 4$21.80, Feb 22 - Dec 21$7.93, May 24 - May 27$21.80, May 9 - Jul 4$21.80, Feb 22 - Dec 21$7.94, May 28 3:14 am$21.80, May 9 - Jul 4$21.80, Feb 22 - Dec 21$14.99, May 28 - Jun 7$21.80, May 9 - Jul 4$21.80, Feb 22 - Dec 21$14.98, Jun 8 - Jun 9$21.80, May 9 - Jul 4$21.80, Feb 22 - Dec 21$14.99, Jun 10 - Jun 17$21.80, May 9 - Jul 4$21.80, Feb 22 - Dec 21$17.80, Jun 18 8:14 pm$21.80, May 9 - Jul 4$21.80, Feb 22 - Dec 21$13.86, Jun 21 - Jun 24$21.80, May 9 - Jul 4$21.80, Feb 22 - Dec 21$17.80, Jun 24 - Jun 26$21.80, May 9 - Jul 4$21.80, Feb 22 - Dec 21$8.49, Jun 27 - Jun 29$21.80, May 9 - Jul 4$21.80, Feb 22 - Dec 21$3.77, Jul 1 7:56 am$21.80, May 9 - Jul 4$21.80, Feb 22 - Dec 21$19.94, Jul 3 - Jul 12$21.80, Feb 22 - Dec 21$21.00, Jul 6 - Jul 18$19.94, Jul 3 - Jul 12$21.80, Feb 22 - Dec 21$21.00, Jul 6 - Jul 18$16.66, Jul 14 - Jul 19$21.80, Feb 22 - Dec 21$19.77, Jul 19 - Nov 3$16.65, Jul 20 - Jul 22$21.80, Feb 22 - Dec 21$19.77, Jul 19 - Nov 3$16.63, Jul 23 - Jul 29$21.80, Feb 22 - Dec 21$19.77, Jul 19 - Nov 3$16.60, Jul 30 8:28 pm$21.80, Feb 22 - Dec 21$19.77, Jul 19 - Nov 3$16.50, Aug 1 - Aug 2$21.80, Feb 22 - Dec 21$19.77, Jul 19 - Nov 3$16.46, Aug 4 - Aug 5$21.80, Feb 22 - Dec 21$19.77, Jul 19 - Nov 3$15.87, Aug 7 6:32 am$21.80, Feb 22 - Dec 21$19.77, Jul 19 - Nov 3$15.58, Aug 10 9:59 am$21.80, Feb 22 - Dec 21$19.77, Jul 19 - Nov 3$15.55, Aug 12 2:20 pm$21.80, Feb 22 - Dec 21$19.77, Jul 19 - Nov 3$9.49, Aug 15 11:36 am$21.80, Feb 22 - Dec 21$19.77, Jul 19 - Nov 3$9.45, Aug 17 1:12 pm$21.80, Feb 22 - Dec 21$19.77, Jul 19 - Nov 3$9.25, Aug 19 5:57 pm$21.80, Feb 22 - Dec 21$19.77, Jul 19 - Nov 3$9.50, Aug 21 - Aug 28$21.80, Feb 22 - Dec 21$19.77, Jul 19 - Nov 3$11.65, Aug 29 11:15 am$21.80, Feb 22 - Dec 21$19.77, Jul 19 - Nov 3$14.99, Sep 1 11:13 pm$21.80, Feb 22 - Dec 21$19.77, Jul 19 - Nov 3$15.60, Sep 3 - Sep 6$21.80, Feb 22 - Dec 21$19.77, Jul 19 - Nov 3$11.97, Sep 9 1:04 am$21.80, Feb 22 - Dec 21$19.77, Jul 19 - Nov 3$14.95, Sep 11 - Sep 12$21.80, Feb 22 - Dec 21$19.77, Jul 19 - Nov 3$14.94, Sep 13 8:21 pm$21.80, Feb 22 - Dec 21$19.77, Jul 19 - Nov 3$14.95, Sep 15 - Sep 20$21.80, Feb 22 - Dec 21$19.77, Jul 19 - Nov 3$15.88, Sep 22 - Sep 25$21.80, Feb 22 - Dec 21$19.77, Jul 19 - Nov 3$15.42, Sep 27 5:54 pm$21.80, Feb 22 - Dec 21$19.77, Jul 19 - Nov 3$8.49, Sep 30 7:49 pm$21.80, Feb 22 - Dec 21$19.77, Jul 19 - Nov 3$8.44, Oct 2 11:00 pm$21.80, Feb 22 - Dec 21$19.77, Jul 19 - Nov 3$8.19, Oct 5 5:03 am$21.80, Feb 22 - Dec 21$19.77, Jul 19 - Nov 3$8.04, Oct 8 9:19 am$21.80, Feb 22 - Dec 21$19.77, Jul 19 - Nov 3$7.70, Oct 11 1:57 pm$21.80, Feb 22 - Dec 21$19.77, Jul 19 - Nov 3$7.30, Oct 13 4:52 pm$21.80, Feb 22 - Dec 21$19.77, Jul 19 - Nov 3$6.93, Oct 15 8:43 pm$21.80, Feb 22 - Dec 21$19.77, Jul 19 - Nov 3$6.59, Oct 18 12:27 am$21.80, Feb 22 - Dec 21$19.77, Jul 19 - Nov 3$6.22, Oct 20 4:59 am$21.80, Feb 22 - Dec 21$19.77, Jul 19 - Nov 3$5.92, Oct 22 10:30 am$21.80, Feb 22 - Dec 21$19.77, Jul 19 - Nov 3$5.06, Oct 27 12:28 am$21.80, Feb 22 - Dec 21$19.77, Jul 19 - Nov 3$4.59, Nov 1 2:56 am$21.80, Feb 22 - Dec 21$19.77, Jul 19 - Nov 3$6.98, Nov 3 10:30 pm$21.80, Feb 22 - Dec 21$18.33, Nov 7 3:10 pm$6.45, Nov 7 3:10 pm$21.80, Feb 22 - Dec 21$17.93, Nov 10 - Dec 7$6.39, Nov 10 8:29 pm$21.80, Feb 22 - Dec 21$17.93, Nov 10 - Dec 7$6.02, Nov 16 3:07 am$21.80, Feb 22 - Dec 21$17.93, Nov 10 - Dec 7$5.69, Nov 19 6:35 am$21.80, Feb 22 - Dec 21$17.93, Nov 10 - Dec 7$5.45, Nov 21 8:48 am$21.80, Feb 22 - Dec 21$17.93, Nov 10 - Dec 7$5.20, Nov 23 9:23 am$21.80, Feb 22 - Dec 21$17.93, Nov 10 - Dec 7$4.74, Nov 27 10:24 am$21.80, Feb 22 - Dec 21$17.93, Nov 10 - Dec 7$2.45, Nov 29 8:41 am$21.80, Feb 22 - Dec 21$17.93, Nov 10 - Dec 7$0.01, Dec 5 - Dec 17$21.80, Feb 22 - Dec 21$18.93, Dec 9 2:58 am$0.01, Dec 5 - Dec 17$21.80, Feb 22 - Dec 21$21.00, Dec 11 - Dec 17$0.01, Dec 5 - Dec 17$21.80, Dec 21 9:26 pm$21.80, Feb 22 - Dec 21$0.97, Dec 21 9:26 pm$21.69, Jan 3 3:25 am$21.69, Jan 3 - Jan 6$1.00, Jan 3 - Jan 6$21.69, Jan 3 - Jan 6$21.00, Jan 4 - Feb 12$1.00, Jan 3 - Jan 6$21.58, Jan 7 - Jan 13$21.00, Jan 4 - Feb 12$1.95, Jan 7 - Jan 19$21.47, Jan 14 - Jan 20$21.00, Jan 4 - Feb 12$1.95, Jan 7 - Jan 19$21.47, Jan 14 - Jan 20$21.00, Jan 4 - Feb 12$1.90, Jan 20 6:39 pm$21.36, Jan 21 - Jan 27$21.00, Jan 4 - Feb 12$3.50, Jan 22 - Jan 24$21.36, Jan 21 - Jan 27$21.00, Jan 4 - Feb 12$3.51, Jan 25 8:22 pm$21.36, Jan 21 - Jan 27$21.00, Jan 4 - Feb 12$3.66, Jan 27 1:44 pm$21.80, Jan 29 - Feb 18$21.00, Jan 4 - Feb 12$7.61, Jan 31 1:29 am$21.80, Jan 29 - Feb 18$21.00, Jan 4 - Feb 12$7.64, Feb 1 8:34 pm$21.80, Jan 29 - Feb 18$21.00, Jan 4 - Feb 12$6.90, Feb 5 11:45 am$21.80, Jan 29 - Feb 18$21.00, Jan 4 - Feb 12$6.38, Feb 6 9:21 am$21.80, Jan 29 - Feb 18$21.00, Jan 4 - Feb 12$8.19, Feb 9 11:54 pm$21.80, Jan 29 - Feb 18$21.00, Jan 4 - Feb 12$8.12, Feb 12 5:35 pm$21.80, Jan 29 - Feb 18$17.93, Feb 14 - Feb 18$8.10, Feb 14 1:13 pm$21.80, Jan 29 - Feb 18$17.93, Feb 14 - Feb 18$8.06, Feb 16 9:25 am$22.75, Feb 20 - Mar 2$18.55, Feb 20 - Mar 2$7.98, Feb 20 5:33 am$22.75, Feb 20 - Mar 2$18.55, Feb 20 - Mar 2$7.97, Feb 22 3:30 am$22.75, Feb 20 - Mar 2$18.55, Feb 20 - Mar 2$7.96, Feb 24 1:43 am$22.75, Feb 20 - Mar 2$18.55, Feb 20 - Mar 2$7.88, Feb 26 12:18 am$22.75, Feb 20 - Mar 2$18.55, Feb 20 - Mar 2$7.77, Mar 2 2:02 am$21.46, Mar 4 - Mar 17$17.93, Mar 4 - Mar 24$7.69, Mar 4 5:54 am$21.46, Mar 4 - Mar 17$17.93, Mar 4 - Mar 24$7.63, Mar 6 8:11 am$21.46, Mar 4 - Mar 17$17.93, Mar 4 - Mar 24$7.43, Mar 8 8:43 am$21.46, Mar 4 - Mar 17$17.93, Mar 4 - Mar 24$7.20, Mar 10 3:02 pm$21.46, Mar 4 - Mar 17$17.93, Mar 4 - Mar 24$7.05, Mar 12 10:16 pm$21.46, Mar 4 - Mar 17$17.93, Mar 4 - Mar 24$6.78, Mar 15 5:51 am$21.46, Mar 4 - Mar 17$17.93, Mar 4 - Mar 24$5.93, Mar 17 5:19 pm$21.47, Mar 20 - Apr 23$17.93, Mar 4 - Mar 24$5.68, Mar 20 2:34 am$21.47, Mar 20 - Apr 23$17.93, Mar 4 - Mar 24$5.54, Mar 22 12:44 pm$21.47, Mar 20 - Apr 23$17.68, Mar 25 - Apr 11$7.15, Mar 25 - Mar 29$21.47, Mar 20 - Apr 23$17.68, Mar 25 - Apr 11$7.14, Mar 31 8:19 pm$21.47, Mar 20 - Apr 23$17.68, Mar 25 - Apr 11$12.47, Apr 3 12:12 pm$21.47, Mar 20 - Apr 23$17.89, Apr 6 - Apr 7$17.68, Mar 25 - Apr 11$21.47, Mar 20 - Apr 23$17.68, Mar 25 - Apr 11$13.87, Apr 8 10:06 pm$21.47, Mar 20 - Apr 23$17.68, Mar 25 - Apr 11$13.89, Apr 11 7:29 pm$21.47, Mar 20 - Apr 23$18.42, Apr 14 - Apr 23$17.30, Apr 15 9:57 pm$21.47, Mar 20 - Apr 23$18.42, Apr 14 - Apr 23$17.18, Apr 18 10:41 am$21.47, Mar 20 - Apr 23$18.42, Apr 14 - Apr 23$17.46, Apr 21 3:34 am$21.47, Mar 20 - Apr 23$18.42, Apr 14 - Apr 23$17.43, Apr 23 9:03 pm$21.47, Apr 27 - Apr 29$18.42, Apr 27 - Apr 29$12.92, Apr 27 1:04 am$21.47, Apr 27 - Apr 29$18.42, Apr 27 - Apr 29$12.87, Apr 29 10:23 pm$23.95, May 2 - May 12$19.74, May 2 - May 12$12.83, May 2 3:19 pm$23.95, May 2 - May 12$19.74, May 2 - May 12$12.79, May 5 9:47 am$23.95, May 2 - May 12$19.74, May 2 - May 12$12.73, May 9 7:05 am$23.95, May 2 - May 12$19.74, May 2 - May 12$12.69, May 12 11:08 am$21.47, May 15 - Jul 7$18.42, May 15 - May 24$12.61, May 15 8:42 pm$21.47, May 15 - Jul 7$18.42, May 15 - May 24$12.53, May 20 2:49 am$21.47, May 15 - Jul 7$18.42, May 15 - May 24$12.45, May 24 5:36 am$21.47, May 15 - Jul 7$17.29, May 28 - Jun 2$12.04, May 28 1:35 pm$21.47, May 15 - Jul 7$17.29, May 28 - Jun 2$11.96, Jun 2 4:46 am$21.47, May 15 - Jul 7$20.52, Jun 6 7:49 pm$11.94, Jun 6 7:49 pm$21.47, May 15 - Jul 7$17.29, Jun 10 - Jun 18$11.95, Jun 10 - Jun 18$21.47, May 15 - Jul 7$19.97, Jun 20 4:33 pm$11.88, Jun 20 4:33 pm$21.47, May 15 - Jul 7$17.29, Jun 24 - Jul 7$0.98, Jun 24 11:08 am$21.47, May 15 - Jul 7$17.29, Jun 24 - Jul 7$0.90, Jun 28 1:20 pm$21.47, May 15 - Jul 7$17.29, Jun 24 - Jul 7$0.84, Jul 2 4:53 pm$21.47, May 15 - Jul 7$17.29, Jun 24 - Jul 7$0.82, Jul 7 12:29 am$23.95, Jul 12 12:58 pm$19.66, Jul 12 12:58 pm$0.80, Jul 12 - Jul 16$21.47, Jul 16 5:10 am$17.29, Jul 16 5:10 am$0.80, Jul 12 - Jul 16$23.95, Jul 19 - Jul 23$19.95, Jul 19 7:06 pm$0.74, Jul 19 7:06 pm$23.95, Jul 19 - Jul 23$17.26, Jul 23 9:01 am$0.68, Jul 23 9:01 am$22.99, Jul 26 - Sep 25$17.00, Jul 26 - Aug 25$0.62, Jul 26 10:46 pm$22.99, Jul 26 - Sep 25$17.00, Jul 26 - Aug 25$0.54, Jul 30 12:42 pm$22.99, Jul 26 - Sep 25$17.00, Jul 26 - Aug 25$0.89, Aug 3 2:54 am$22.99, Jul 26 - Sep 25$17.00, Jul 26 - Aug 25$11.94, Aug 6 6:35 pm$22.99, Jul 26 - Sep 25$17.00, Jul 26 - Aug 25$10.91, Aug 10 2:33 pm$22.99, Jul 26 - Sep 25$17.00, Jul 26 - Aug 25$10.50, Aug 14 9:28 am$22.99, Jul 26 - Sep 25$17.00, Jul 26 - Aug 25$9.45, Aug 18 3:06 am$22.99, Jul 26 - Sep 25$17.00, Jul 26 - Aug 25$6.33, Aug 21 9:30 pm$22.99, Jul 26 - Sep 25$17.00, Jul 26 - Aug 25$4.45, Aug 25 3:48 pm$22.99, Jul 26 - Sep 25$16.89, Aug 29 10:15 am$3.55, Aug 29 10:15 am$22.99, Jul 26 - Sep 25$16.85, Sep 2 - Sep 6$2.60, Sep 2 3:35 am$22.99, Jul 26 - Sep 25$16.85, Sep 2 - Sep 6$2.48, Sep 6 - Sep 13$22.99, Jul 26 - Sep 25$16.88, Sep 9 - Oct 19$2.48, Sep 6 - Sep 13$22.99, Jul 26 - Sep 25$16.88, Sep 9 - Oct 19$10.83, Sep 17 - Sep 21$22.99, Jul 26 - Sep 25$16.88, Sep 9 - Oct 19$8.35, Sep 25 12:52 pm$23.21, Sep 29 - Oct 3$16.88, Sep 9 - Oct 19$10.82, Sep 29 11:04 am$23.21, Sep 29 - Oct 3$16.88, Sep 9 - Oct 19$10.73, Oct 3 12:32 pm$23.95, Oct 7 - Dec 20$16.88, Sep 9 - Oct 19$10.70, Oct 7 3:03 pm$23.95, Oct 7 - Dec 20$16.88, Sep 9 - Oct 19$0.78, Oct 11 5:30 pm$23.95, Oct 7 - Dec 20$16.88, Sep 9 - Oct 19$4.99, Oct 15 - Oct 23$23.95, Oct 7 - Dec 20$9.95, Oct 23 - Feb 8$4.99, Oct 15 - Oct 23$23.95, Oct 7 - Dec 20$9.95, Oct 23 - Feb 8$6.97, Oct 27 7:39 am$23.95, Oct 7 - Dec 20$9.95, Oct 23 - Feb 8$6.39, Oct 31 7:19 am$23.95, Oct 7 - Dec 20$9.95, Oct 23 - Feb 8$4.55, Nov 4 7:20 am$23.95, Oct 7 - Dec 20$9.95, Oct 23 - Feb 8$0.96, Nov 8 10:00 am$23.95, Oct 7 - Dec 20$9.95, Oct 23 - Feb 8$0.78, Nov 12 12:37 pm$23.95, Oct 7 - Dec 20$9.95, Oct 23 - Feb 8$0.75, Nov 14 2:32 pm$23.95, Oct 7 - Dec 20$9.95, Oct 23 - Feb 8$0.72, Nov 16 6:50 pm$23.95, Oct 7 - Dec 20$9.95, Oct 23 - Feb 8$0.50, Nov 21 3:33 am$23.95, Oct 7 - Dec 20$9.95, Oct 23 - Feb 8$0.18, Nov 25 1:54 pm$23.95, Oct 7 - Dec 20$9.95, Oct 23 - Feb 8$0.01, Nov 30 - Jan 18$22.99, Dec 25 - Feb 2$9.95, Oct 23 - Feb 8$0.01, Nov 30 - Jan 18$22.99, Dec 25 - Feb 2$9.95, Oct 23 - Feb 8$4.90, Jan 23 10:48 pm$22.99, Dec 25 - Feb 2$9.95, Oct 23 - Feb 8$5.95, Jan 29 12:12 am$22.99, Dec 25 - Feb 2$9.95, Oct 23 - Feb 8$5.62, Feb 2 11:49 pm$23.21, Feb 8 1:16 am$9.95, Oct 23 - Feb 8$4.96, Feb 8 1:16 am$23.95, Feb 13 - Apr 11$16.88, Feb 13 - Apr 11$4.91, Feb 13 6:38 am$23.95, Feb 13 - Apr 11$16.88, Feb 13 - Apr 11$4.85, Feb 18 3:03 pm$23.95, Feb 13 - Apr 11$16.88, Feb 13 - Apr 11$4.01, Feb 24 4:46 am$23.95, Feb 13 - Apr 11$16.88, Feb 13 - Apr 11$3.14, Mar 2 11:01 am$23.95, Feb 13 - Apr 11$16.88, Feb 13 - Apr 11$2.57, Mar 7 10:16 pm$23.95, Feb 13 - Apr 11$16.88, Feb 13 - Apr 11$1.27, Mar 19 6:15 am$23.95, Feb 13 - Apr 11$16.88, Feb 13 - Apr 11$0.75, Mar 30 5:42 pm$23.95, Feb 13 - Apr 11$16.88, Feb 13 - Apr 11$0.46, Apr 5 8:01 pm$23.95, Feb 13 - Apr 11$16.88, Feb 13 - Apr 11$0.39, Apr 11 3:07 pm 23,0941,142,196 781,250 390,625 Oct Dec Feb Apr Jun Aug Oct Dec Feb Apr Jun 2015 2016

Price Details

New

Last Seen $23.95 Apr 11, '16
Highest $23.95 Feb 13, '16
Lowest $17.90 Feb 21, '14
Average $23.95 (30d avg)
$23.62 (90d avg)
$23.69 (180d avg)
$23.08 (365d avg)
$21.80 (Lifetime average)
Added Sep 10, 2013

3rd Party New

Last Seen $16.88 Apr 11, '16
Highest $21.80 Dec 21, '14
Lowest $9.95 Oct 23, '15
Average $16.88 (30d avg)
$14.44 (90d avg)
$12.53 (180d avg)
$15.15 (365d avg)
$17.45 (Lifetime average)
Added Sep 10, 2013

3rd Party Used

Last Seen $0.39 Apr 11, '16
Highest $19.94 Jul 3, '14
Lowest $0.01 Nov 30, '15
Average $0.93 (30d avg)
$2.88 (90d avg)
$2.26 (180d avg)
$5.19 (365d avg)
$7.12 (Lifetime average)
Added Sep 10, 2013

Sales Rank

30 day average: 435,803
90 day average: 549,841

Product Description

Teachers and Machines: The Classroom Use of Technology Since 1920

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