Tracked by Evreward since 2005, Lensmart.com offers coupons and cash back rebates, with savings as high as $45 off. Lensmart.com discount coupons are rare, only available once or twice a year, but are often more valuable than similar merchants. Even when Lensmart.com doesn't have a coupon, you can always get up to 10% cash back, and other great rewards, with every purchase.