Tracked by Evreward since 2011, Karen Millen offers coupons, cash back rebates and rewards, with savings as high as 25% off. Karen Millen discount coupons are rare, only available once or twice a year, but are often more valuable than similar merchants. Even when Karen Millen doesn't have a coupon, you can always get up to 20% cash back, and other great rewards, with every purchase.