One of Evreward's most popular merchants since 2005, Starbucks offers coupons and cash back rebates, with savings as high as $25 off. Starbucks discount coupons are rare, only available once or twice a year, but are often more valuable than similar merchants. Even when Starbucks doesn't have a coupon, you can always get up to 10% cash back, and other great rewards, with every purchase.