One of Evreward's most popular merchants since 2005, Vitacost.com offers coupons, cash back rebates and rewards, with savings as high as 50% off. Vitacost.com discount coupons are plentiful, usually available every month, and are often more valuable than similar merchants. Even when Vitacost.com doesn't have a coupon, you can always get up to 16% cash back, and other great rewards, with every purchase.