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Buy from Amazon $9.98$0.01 $7.50 $5.00 $2.50 Nov Jan Mar May Jul Sep Nov Jan Mar May 2015 2016 $8.94, Sep 26 - Oct 1$1.69, Sep 26 2:18 am$0.01, Sep 26 - Apr 25$8.94, Sep 26 - Oct 1$1.67, Sep 28 2:42 am$0.01, Sep 26 - Apr 25$8.94, Sep 26 - Oct 1$1.95, Sep 30 - Oct 6$0.01, Sep 26 - Apr 25$8.98, Oct 3 - Oct 29$1.95, Sep 30 - Oct 6$0.01, Sep 26 - Apr 25$8.98, Oct 3 - Oct 29$2.47, Oct 8 - Oct 10$0.01, Sep 26 - Apr 25$8.98, Oct 3 - Oct 29$1.89, Oct 12 6:30 pm$0.01, Sep 26 - Apr 25$8.98, Oct 3 - Oct 29$2.47, Oct 14 - Oct 17$0.01, Sep 26 - Apr 25$8.98, Oct 3 - Oct 29$1.85, Oct 19 5:24 am$0.01, Sep 26 - Apr 25$8.98, Oct 3 - Oct 29$2.49, Oct 21 10:09 am$0.01, Sep 26 - Apr 25$8.98, Oct 3 - Oct 29$2.47, Oct 23 - Oct 29$0.01, Sep 26 - Apr 25$8.97, Nov 3 - Nov 15$2.50, Nov 3 - Nov 20$0.01, Sep 26 - Apr 25$8.98, Nov 18 - Nov 26$2.50, Nov 3 - Nov 20$0.01, Sep 26 - Apr 25$8.98, Nov 18 - Nov 26$2.47, Nov 22 - Nov 26$0.01, Sep 26 - Apr 25$8.89, Nov 28 - Dec 4$2.48, Nov 28 - Dec 14$0.01, Sep 26 - Apr 25$8.87, Dec 6 - Dec 16$2.48, Nov 28 - Dec 14$0.01, Sep 26 - Apr 25$8.87, Dec 6 - Dec 16$2.25, Dec 16 11:16 am$0.01, Sep 26 - Apr 25$8.91, Dec 18 10:15 am$1.87, Dec 18 10:15 am$0.01, Sep 26 - Apr 25$8.98, Dec 22 12:09 pm$1.31, Dec 22 12:09 pm$0.01, Sep 26 - Apr 25$8.97, Dec 23 - Jan 6$1.15, Dec 23 3:35 pm$0.01, Sep 26 - Apr 25$8.97, Dec 23 - Jan 6$1.01, Dec 24 2:47 pm$0.01, Sep 26 - Apr 25$8.97, Dec 23 - Jan 6$2.48, Dec 25 - Dec 30$0.01, Sep 26 - Apr 25$8.97, Dec 23 - Jan 6$2.47, Dec 31 7:12 pm$0.01, Sep 26 - Apr 25$8.97, Dec 23 - Jan 6$2.43, Jan 2 1:55 pm$0.01, Sep 26 - Apr 25$8.97, Dec 23 - Jan 6$2.25, Jan 4 5:01 am$0.01, Sep 26 - Apr 25$8.97, Dec 23 - Jan 6$2.03, Jan 6 6:46 am$0.01, Sep 26 - Apr 25$8.98, Jan 7 - Jan 20$1.93, Jan 7 9:25 am$0.01, Sep 26 - Apr 25$8.98, Jan 7 - Jan 20$1.71, Jan 9 11:31 am$0.01, Sep 26 - Apr 25$8.98, Jan 7 - Jan 20$1.59, Jan 10 3:38 pm$0.01, Sep 26 - Apr 25$8.98, Jan 7 - Jan 20$1.49, Jan 11 11:48 pm$0.01, Sep 26 - Apr 25$8.98, Jan 7 - Jan 20$2.45, Jan 13 11:26 am$0.01, Sep 26 - Apr 25$8.98, Jan 7 - Jan 20$2.44, Jan 15 - Feb 11$0.01, Sep 26 - Apr 25$8.63, Jan 21 - Jan 25$2.44, Jan 15 - Feb 11$0.01, Sep 26 - Apr 25$8.98, Jan 26 - Feb 8$2.44, Jan 15 - Feb 11$0.01, Sep 26 - Apr 25$8.68, Feb 9 - Feb 28$2.44, Jan 15 - Feb 11$0.01, Sep 26 - Apr 25$8.68, Feb 9 - Feb 28$2.40, Feb 13 12:03 pm$0.01, Sep 26 - Apr 25$8.68, Feb 9 - Feb 28$2.35, Feb 15 8:07 am$0.01, Sep 26 - Apr 25$8.68, Feb 9 - Feb 28$1.00, Feb 17 - Feb 21$0.01, Sep 26 - Apr 25$8.68, Feb 9 - Feb 28$0.99, Feb 23 12:32 am$0.01, Sep 26 - Apr 25$8.68, Feb 9 - Feb 28$0.89, Feb 24 9:29 pm$0.01, Sep 26 - Apr 25$8.68, Feb 9 - Feb 28$0.77, Feb 26 7:51 pm$0.01, Sep 26 - Apr 25$8.68, Feb 9 - Feb 28$0.65, Feb 28 5:08 pm$0.01, Sep 26 - Apr 25$8.66, Mar 3 - Mar 17$0.49, Mar 3 7:23 am$0.01, Sep 26 - Apr 25$8.66, Mar 3 - Mar 17$0.37, Mar 5 6:14 am$0.01, Sep 26 - Apr 25$8.66, Mar 3 - Mar 17$0.25, Mar 7 5:49 am$0.01, Sep 26 - Apr 25$8.66, Mar 3 - Mar 17$0.22, Mar 9 5:12 am$0.01, Sep 26 - Apr 25$8.66, Mar 3 - Mar 17$0.16, Mar 11 - Apr 8$0.01, Sep 26 - Apr 25$9.98, Mar 19 - Apr 25$0.16, Mar 11 - Apr 8$0.01, Sep 26 - Apr 25$9.98, Apr 28 - Mar 24$0.01, Apr 28 - Apr 16$0.01, Apr 28 - May 30$9.98, Apr 28 - Mar 24$0.41, Jun 4 5:04 am$0.01, Apr 28 - Apr 16$9.98, Apr 28 - Mar 24$0.39, Jun 8 2:20 pm$0.01, Apr 28 - Apr 16$9.98, Apr 28 - Mar 24$0.37, Jun 12 11:43 am$0.01, Apr 28 - Apr 16$9.98, Apr 28 - Mar 24$0.36, Jun 16 7:05 am$0.01, Apr 28 - Apr 16$9.98, Apr 28 - Mar 24$0.34, Jun 20 1:39 am$0.01, Apr 28 - Apr 16$9.98, Apr 28 - Mar 24$0.33, Jun 23 7:36 pm$0.01, Apr 28 - Apr 16$9.98, Apr 28 - Mar 24$0.31, Jun 27 2:26 pm$0.01, Apr 28 - Apr 16$9.98, Apr 28 - Mar 24$0.30, Jul 1 4:39 pm$0.01, Apr 28 - Apr 16$9.98, Apr 28 - Mar 24$0.28, Jul 5 11:00 pm$0.01, Apr 28 - Apr 16$9.98, Apr 28 - Mar 24$0.27, Jul 11 9:55 pm$0.01, Apr 28 - Apr 16$9.98, Apr 28 - Mar 24$0.25, Jul 15 - Jul 19$0.01, Apr 28 - Apr 16$9.98, Apr 28 - Mar 24$0.23, Jul 22 - Jul 26$0.01, Apr 28 - Apr 16$9.98, Apr 28 - Mar 24$0.22, Jul 29 11:05 pm$0.01, Apr 28 - Apr 16$9.98, Apr 28 - Mar 24$0.21, Aug 2 1:24 pm$0.01, Apr 28 - Apr 16$9.98, Apr 28 - Mar 24$0.20, Aug 6 5:10 am$0.01, Apr 28 - Apr 16$9.98, Apr 28 - Mar 24$0.19, Aug 10 12:19 am$0.01, Apr 28 - Apr 16$9.98, Apr 28 - Mar 24$0.18, Aug 13 - Aug 17$0.01, Apr 28 - Apr 16$9.98, Apr 28 - Mar 24$0.17, Aug 21 7:35 am$0.01, Apr 28 - Apr 16$9.98, Apr 28 - Mar 24$0.16, Aug 25 2:00 am$0.01, Apr 28 - Apr 16$9.98, Apr 28 - Mar 24$0.15, Aug 28 - Sep 1$0.01, Apr 28 - Apr 16$9.98, Apr 28 - Mar 24$0.14, Sep 5 10:14 am$0.01, Apr 28 - Apr 16$9.98, Apr 28 - Mar 24$0.13, Sep 9 - Sep 13$0.01, Apr 28 - Apr 16$9.98, Apr 28 - Mar 24$0.12, Sep 17 - Sep 20$0.01, Apr 28 - Apr 16$9.98, Apr 28 - Mar 24$0.11, Sep 24 - Sep 28$0.01, Apr 28 - Apr 16$9.98, Apr 28 - Mar 24$0.10, Oct 2 - Oct 6$0.01, Apr 28 - Apr 16$9.98, Apr 28 - Mar 24$0.09, Oct 11 - Oct 15$0.01, Apr 28 - Apr 16$9.98, Apr 28 - Mar 24$0.08, Oct 18 - Oct 26$0.01, Apr 28 - Apr 16$9.98, Apr 28 - Mar 24$0.07, Oct 30 - Nov 3$0.01, Apr 28 - Apr 16$9.98, Apr 28 - Mar 24$0.14, Nov 7 4:41 pm$0.01, Apr 28 - Apr 16$9.98, Apr 28 - Mar 24$0.13, Nov 11 7:36 pm$0.01, Apr 28 - Apr 16$9.98, Apr 28 - Mar 24$0.12, Nov 16 - Nov 20$0.01, Apr 28 - Apr 16$9.98, Apr 28 - Mar 24$0.11, Nov 24 6:59 pm$0.01, Apr 28 - Apr 16$9.98, Apr 28 - Mar 24$0.10, Nov 29 - Dec 4$0.01, Apr 28 - Apr 16$9.98, Apr 28 - Mar 24$0.08, Dec 9 12:17 pm$0.01, Apr 28 - Apr 16$9.98, Apr 28 - Mar 24$0.07, Dec 14 - Dec 19$0.01, Apr 28 - Apr 16$9.98, Apr 28 - Mar 24$0.02, Dec 24 8:07 am$0.01, Apr 28 - Apr 16$9.98, Apr 28 - Mar 24$0.01, Apr 28 - Apr 16$0.01, Dec 29 9:27 am$9.98, Apr 28 - Mar 24$1.51, Jan 3 4:43 am$0.01, Apr 28 - Apr 16$9.98, Apr 28 - Mar 24$0.01, Apr 28 - Apr 16$0.01, Jan 8 - Jan 23$9.98, Apr 28 - Mar 24$1.51, Jan 28 - Feb 7$0.01, Apr 28 - Apr 16$9.98, Apr 28 - Mar 24$0.01, Apr 28 - Apr 16$0.01, Feb 12 - Apr 4$9.09, Apr 4 10:59 pm$0.01, Apr 28 - Apr 16$0.01, Feb 12 - Apr 4$6.39, Apr 16 3:24 pm$2.14, Apr 16 3:24 pm$0.01, Apr 28 - Apr 16 108,0651,766,223 1,953,125 1,562,500 1,171,875 781,250 390,625 Nov Jan Mar May Jul Sep Nov Jan Mar May 2015 2016

Price Details

New

Latest $6.39 Apr 16, '16
Highest $9.98 Apr 28, '15
Lowest $6.39 Apr 16, '16
Average $9.63 (30d avg)
$9.86 (90d avg)
$9.92 (180d avg)
$9.95 (365d avg)
$9.63 (Lifetime average)
Added Sep 26, 2014

3rd Party New

Latest $2.14 Apr 16, '16
Highest $2.50 Nov 3, '14
Lowest $0.01 Feb 12, '16
Average $0.01 (30d avg)
$0.26 (90d avg)
$0.21 (180d avg)
$0.18 (365d avg)
$0.74 (Lifetime average)
Added Sep 26, 2014

3rd Party Used

Latest $0.01 Apr 16, '16
Highest $0.01 Apr 28, '15
Lowest $0.01 Apr 28, '15
Average $0.01 (30d avg)
$0.01 (90d avg)
$0.01 (180d avg)
$0.01 (365d avg)
$0.01 (Lifetime average)
Added Sep 26, 2014

Sales Rank

30 day average: 1,740,477
90 day average: 1,652,701

Product Description

IQ, or intelligence quotient, doesn't simply gauge how smart you are by how many things you know; it's a measure of your ability to reason, use judgment and solve problems-skills that serve you every day in a multitude of situations. presents more than 250 mental challenges and puzzles that are designed to keep your mind sharp and ward off brain aging.The 192-page book is divided into four chapters of increasing challenge and difficulty. Each chapter includes these types of IQ-sharpening puzzles:Solutions to all puzzles and challenges are provided. You are never too old to learn new things or sharpen your mental functioning. is for people of all ages.

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