One of Evreward's most popular merchants since 2009, ASOS offers coupons, cash back rebates and rewards, with savings as high as 20% off. ASOS discount coupons are somehwat rare, available a few times each year, and can be less valuable than similar merchants. Even when ASOS doesn't have a coupon, you can always get up to 20% cash back, and other great rewards, with every purchase.