Popular on Evreward since 2005, Sharper Image offers coupons, cash back rebates and rewards, with savings as high as 20% off. Sharper Image discount coupons are infrequent, only available a couple times per year, but are often more valuable than similar merchants. Even when Sharper Image doesn't have a coupon, you can always get up to 15% cash back, and other great rewards, with every purchase.