Tracked by Evreward since 2008, Tom Thumb offers coupons, cash back rebates and rewards, with savings as high as $20 off. Tom Thumb discount coupons are infrequent, only available a couple times per year, and can be less valuable than similar merchants. Even when Tom Thumb doesn't have a coupon, you can always get up to $10 cash back, and other great rewards, with every purchase.