Tracked by Evreward since 2010, SodaStream offers coupons, cash back rebates and rewards, with savings as high as 50% off. SodaStream discount coupons are rare, only available once or twice a year, but are often more valuable than similar merchants. Even when SodaStream doesn't have a coupon, you can always get up to 20% cash back, and other great rewards, with every purchase.