Someone explained to me that they can hit a key on the register before they scan a coupon that will keep it from doubling, but they have to catch it. My first mistake was going to the closest store early in the morning when it's not too busy. They're the "Coupon Nazis" there, all their cashiers will look over every coupon. If I had gone to the one further away it probably would have been better. Or I'll start going after lunch when it's busier. I'll have to look for those Hamburger Helper peelies though, thanks for the heads up!
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