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Amazon [amazon.com] has National Geographic Kids Why?: Over 1,111 Answers to Everything (Hardcover) for $7.50.
Shipping is free with Prime or on $35+ orders.

Price
$14.49 lower (66% savings) than the list price of $21.99
$0.39 lower (5% savings) than the previous price of $7.89

*Previous Frontpage Deal at $8.60 with 55 Deal Score and 7 comments.