Well, I have found some that just keep track of the coupons you have, tell you when they expire. Others do that as well as store a price on the products so you can print out a shopping list.
I have yet to do all my shopping at 1 grocery store, I get better prices if I go to different stores.
I would personally love to have a program that keeps the prices for the products you buy, the size of that product, the price of it (at all of the stores you shop), tracks when the items are supposed to go on sale (sale cycles), and then it would print out a shopping list for the quantites you enter at the stores you choose and give you a subtotal.
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