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Buy from Amazon $21.95$0.01 $18.00 $13.50 $9.00 $4.50 Jan Apr Jul Oct Jan Apr Jul Oct Jan Apr Jul 2014 2015 2016 $18.04, Oct 1 11:10 am$18.07, Nov 20 3:30 pm$18.10, Nov 24 - Dec 3$18.13, Dec 5 - Dec 22$18.16, Dec 24 - Jan 10$18.19, Jan 11 - Jan 30$18.22, Jan 31 - Feb 18$18.25, Feb 18 - Feb 26$18.03, Feb 26 - Mar 29$18.06, Mar 30 - Apr 15$18.10, Apr 15 - Apr 26$17.88, Apr 27 - May 1$17.52, May 2 - May 24$8.72, May 3 - May 5$0.01, May 3 - Apr 24$17.52, May 2 - May 24$8.70, May 8 - May 9$0.01, May 3 - Apr 24$17.52, May 2 - May 24$11.82, May 9 - May 12$0.01, May 3 - Apr 24$17.52, May 2 - May 24$11.74, May 12 - May 13$0.01, May 3 - Apr 24$17.52, May 2 - May 24$9.99, May 14 - May 22$0.01, May 3 - Apr 24$17.52, May 2 - May 24$9.98, May 23 - May 24$0.01, May 3 - Apr 24$17.16, May 25 - Jun 5$9.99, May 25 4:45 am$0.01, May 3 - Apr 24$17.16, May 25 - Jun 5$9.98, May 25 - May 27$0.01, May 3 - Apr 24$17.16, May 25 - Jun 5$9.83, May 28 - May 31$0.01, May 3 - Apr 24$17.16, May 25 - Jun 5$9.82, May 31 - Jun 2$0.01, May 3 - Apr 24$17.16, May 25 - Jun 5$9.81, Jun 3 10:38 pm$0.01, May 3 - Apr 24$17.16, May 25 - Jun 5$9.82, Jun 5 10:05 am$0.01, May 3 - Apr 24$17.47, Jun 7 - Jun 26$9.98, Jun 8 - Jun 13$0.01, May 3 - Apr 24$17.47, Jun 7 - Jun 26$9.83, Jun 14 - Jun 18$0.01, May 3 - Apr 24$17.47, Jun 7 - Jun 26$9.66, Jun 21 4:59 am$0.01, May 3 - Apr 24$17.47, Jun 7 - Jun 26$9.35, Jun 23 - Jun 27$0.01, May 3 - Apr 24$17.77, Jun 27 - Jul 3$8.98, Jun 28 3:10 am$0.01, May 3 - Apr 24$17.77, Jun 27 - Jul 3$8.99, Jun 28 - Jun 30$0.01, May 3 - Apr 24$17.77, Jun 27 - Jul 3$8.96, Jul 2 6:29 pm$0.01, May 3 - Apr 24$18.07, Jul 5 - Jul 12$8.95, Jul 3 - Jul 5$0.01, May 3 - Apr 24$18.07, Jul 5 - Jul 12$8.93, Jul 6 - Jul 7$0.01, May 3 - Apr 24$18.07, Jul 5 - Jul 12$8.91, Jul 10 1:25 am$0.01, May 3 - Apr 24$18.07, Jul 5 - Jul 12$8.89, Jul 12 - Jul 14$0.01, May 3 - Apr 24$18.36, Jul 14 - Jul 21$8.88, Jul 15 6:24 am$0.01, May 3 - Apr 24$18.36, Jul 14 - Jul 21$8.86, Jul 18 - Jul 21$0.01, May 3 - Apr 24$17.99, Jul 22 - Jul 31$6.98, Jul 22 - Aug 7$0.01, May 3 - Apr 24$17.63, Aug 1 - Aug 8$6.98, Jul 22 - Aug 7$0.01, May 3 - Apr 24$17.63, Aug 1 - Aug 8$8.48, Aug 8 2:28 pm$0.01, May 3 - Apr 24$17.27, Aug 9 - Aug 17$6.98, Aug 10 - Aug 25$0.01, May 3 - Apr 24$16.92, Aug 18 - Aug 28$6.98, Aug 10 - Aug 25$0.01, May 3 - Apr 24$16.92, Aug 18 - Aug 28$3.99, Aug 26 - Sep 20$0.01, May 3 - Apr 24$17.18, Aug 30 - Sep 6$3.99, Aug 26 - Sep 20$0.01, May 3 - Apr 24$17.49, Sep 9 - Sep 17$3.99, Aug 26 - Sep 20$0.01, May 3 - Apr 24$17.40, Sep 20 - Sep 22$3.99, Aug 26 - Sep 20$0.01, May 3 - Apr 24$17.40, Sep 20 - Sep 22$3.84, Sep 22 1:57 pm$0.01, May 3 - Apr 24$17.39, Sep 24 - Oct 17$3.43, Sep 24 3:38 pm$0.01, May 3 - Apr 24$17.39, Sep 24 - Oct 17$2.63, Sep 28 7:37 pm$0.01, May 3 - Apr 24$17.39, Sep 24 - Oct 17$3.99, Sep 30 - Oct 3$0.01, May 3 - Apr 24$17.39, Sep 24 - Oct 17$4.00, Oct 5 2:03 am$0.01, May 3 - Apr 24$17.39, Sep 24 - Oct 17$3.99, Oct 7 - Oct 11$0.01, May 3 - Apr 24$17.39, Sep 24 - Oct 17$3.43, Oct 15 1:48 pm$0.01, May 3 - Apr 24$17.39, Sep 24 - Oct 17$3.03, Oct 17 5:51 pm$0.01, May 3 - Apr 24$17.83, Oct 19 - Oct 30$2.61, Oct 19 10:26 pm$0.01, May 3 - Apr 24$17.83, Oct 19 - Oct 30$2.24, Oct 22 4:06 am$0.01, May 3 - Apr 24$17.83, Oct 19 - Oct 30$1.97, Oct 24 10:39 am$0.01, May 3 - Apr 24$17.83, Oct 19 - Oct 30$3.99, Oct 30 - Nov 11$0.01, May 3 - Apr 24$18.26, Nov 4 11:00 pm$3.99, Oct 30 - Nov 11$0.01, May 3 - Apr 24$18.69, Nov 11 - Nov 19$3.99, Oct 30 - Nov 11$0.01, May 3 - Apr 24$18.69, Nov 11 - Nov 19$4.00, Nov 16 - Nov 21$0.01, May 3 - Apr 24$19.12, Nov 21 - Mar 19$4.00, Nov 25 7:10 pm$0.01, May 3 - Apr 24$19.12, Nov 21 - Mar 19$3.99, Nov 27 - Nov 29$0.01, May 3 - Apr 24$19.12, Nov 21 - Mar 19$4.00, Dec 1 1:35 pm$0.01, May 3 - Apr 24$19.12, Nov 21 - Mar 19$3.93, Dec 5 9:27 am$0.01, May 3 - Apr 24$19.12, Nov 21 - Mar 19$3.66, Dec 7 7:34 am$0.01, May 3 - Apr 24$19.12, Nov 21 - Mar 19$3.35, Dec 9 9:42 am$0.01, May 3 - Apr 24$19.12, Nov 21 - Mar 19$3.14, Dec 11 10:37 am$0.01, May 3 - Apr 24$19.12, Nov 21 - Mar 19$3.99, Dec 13 - Feb 5$0.01, May 3 - Apr 24$19.12, Nov 21 - Mar 19$3.72, Feb 7 - Feb 8$0.01, May 3 - Apr 24$19.12, Nov 21 - Mar 19$3.66, Feb 10 - Feb 23$0.01, May 3 - Apr 24$19.12, Nov 21 - Mar 19$7.23, Feb 25 4:11 pm$0.01, May 3 - Apr 24$19.12, Nov 21 - Mar 19$3.66, Feb 27 - Mar 12$0.01, May 3 - Apr 24$19.12, Nov 21 - Mar 19$7.23, Mar 14 5:26 pm$0.01, May 3 - Apr 24$19.12, Nov 21 - Mar 19$7.71, Mar 17 - Apr 24$0.01, May 3 - Apr 24$19.69, Mar 22 - Mar 29$7.71, Mar 17 - Apr 24$0.01, May 3 - Apr 24$20.15, Apr 27 - Nov 19$7.71, Apr 27 - May 25$0.01, Apr 27 - Nov 2$20.15, Apr 27 - Nov 19$12.00, May 29 - Aug 13$0.01, Apr 27 - Nov 2$20.15, Apr 27 - Nov 19$11.91, Aug 16 8:28 pm$0.01, Apr 27 - Nov 2$20.15, Apr 27 - Nov 19$11.81, Aug 20 3:05 pm$0.01, Apr 27 - Nov 2$20.15, Apr 27 - Nov 19$11.44, Aug 24 - Oct 6$0.01, Apr 27 - Nov 2$20.15, Apr 27 - Nov 19$11.97, Oct 10 - Oct 18$0.01, Apr 27 - Nov 2$20.15, Apr 27 - Nov 19$11.44, Oct 22 - Jan 25$0.01, Apr 27 - Nov 2$20.15, Apr 27 - Nov 19$11.44, Oct 22 - Jan 25$0.03, Nov 7 - Nov 15$20.15, Apr 27 - Nov 19$11.44, Oct 22 - Jan 25$0.01, Nov 19 - Apr 9$20.34, Nov 24 2:28 am$11.44, Oct 22 - Jan 25$0.01, Nov 19 - Apr 9$20.58, Nov 28 5:56 pm$11.44, Oct 22 - Jan 25$0.01, Nov 19 - Apr 9$21.01, Dec 3 - Dec 8$11.44, Oct 22 - Jan 25$0.01, Nov 19 - Apr 9$21.95, Dec 13 - Mar 6$11.44, Oct 22 - Jan 25$0.01, Nov 19 - Apr 9$21.95, Dec 13 - Mar 6$11.43, Jan 30 12:51 am$0.01, Nov 19 - Apr 9$21.95, Dec 13 - Mar 6$11.40, Feb 4 3:07 am$0.01, Nov 19 - Apr 9$21.95, Dec 13 - Mar 6$11.33, Feb 9 4:56 am$0.01, Nov 19 - Apr 9$21.95, Dec 13 - Mar 6$11.29, Feb 14 11:38 am$0.01, Nov 19 - Apr 9$21.95, Dec 13 - Mar 6$11.22, Feb 19 7:24 pm$0.01, Nov 19 - Apr 9$21.95, Dec 13 - Mar 6$11.12, Feb 25 8:34 am$0.01, Nov 19 - Apr 9$21.95, Dec 13 - Mar 6$10.99, Mar 6 8:18 am$0.01, Nov 19 - Apr 9$21.58, Mar 17 - Apr 9$10.91, Mar 17 7:24 pm$0.01, Nov 19 - Apr 9$21.58, Mar 17 - Apr 9$10.86, Mar 29 8:04 am$0.01, Nov 19 - Apr 9$21.58, Mar 17 - Apr 9$10.79, Apr 9 5:26 pm$0.01, Nov 19 - Apr 9 129,7981,709,396 1,953,125 1,562,500 1,171,875 781,250 390,625 0 Oct Dec Feb Apr Jun Aug Oct Dec Feb Apr Jun 2015 2016

Price Details

New

Latest $21.58 15 hrs ago
Highest $21.95 Dec 13, '15
Lowest $16.92 Aug 18, '14
Average $21.58 (30d avg)
$21.86 (90d avg)
$21.35 (180d avg)
$20.74 (365d avg)
$19.21 (Lifetime average)
Added Oct 1, 2013

3rd Party New

Latest $10.79 15 hrs ago
Highest $12.00 May 29, '15
Lowest $1.97 Oct 24, '14
Average $10.89 (30d avg)
$11.17 (90d avg)
$11.33 (180d avg)
$11.02 (365d avg)
$8.49 (Lifetime average)
Added Oct 1, 2013

3rd Party Used

Latest $0.01 15 hrs ago
Highest $0.03 Nov 7, '15
Lowest $0.01 Nov 19, '15
Average $0.01 (30d avg)
$0.01 (90d avg)
$0.01 (180d avg)
$0.01 (365d avg)
$0.01 (Lifetime average)
Added Oct 1, 2013

Sales Rank

30 day average: 1,382,148
90 day average: 965,099

Product Description

Do you want to expand your mental power? Think more clearly, logically, and creatively? Improve your memory? Solve problems and make decisions more effectively?

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