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Amazon [amazon.com] has The Klutz Book of Paper Airplanes for $ 10.92 – $ 3.64 when you ‘clip’ the coupon on product page = $ 7.28. Shipping is free with Prime or on $ 35+ orders.

Price:
$ 9.67 lower (57% savings) than the list price of $ 16.95
$ 7.28 lower (50% savings) than the previous price of $ 14.56