RadioShack retail locations take $10 off purchases of $40 or more via this printable coupon. (You'll receive the coupon via email.) That's among the best printable coupon we've seen from RadioShack, although we saw $10 off $20 offered in March. Some exclusions apply, including Bose, Apple and Beats by Dr. Dre products, gift cards, and more. Coupon expires May 17.