One of Evreward's most popular merchants since 2005, LEGO offers coupons, cash back rebates and rewards, with savings as high as $30 off. LEGO discount coupons are seasonal, appearing every three to four months, and are often more valuable than similar merchants. Even when LEGO doesn't have a coupon, you can always get up to 15% cash back, and other great rewards, with every purchase.