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Editor’s Note: This story originally appeared on Living on the Cheap. Of course, everyone would like to cut the supermarket bill by 50% or more. After all, on average we spend $387 per month on groceries. But you don’t have to go to the extremes you see on “Extreme Couponing” or map out the invasion of the store like it’s a small dictatorship. Instead, stock up on common sense and some planning.