When doing your grocery shopping, it's helpful to know the regular prices of staples and family favorites, and what store has the best prices on those items. That way, you'll know a good sale price when you come across it and can stock up appropriately. This will keep you from having to run out for last-minute items that will inevitably be full-price when you need them. A lot of produce items can be purchased for great prices during the peak of their season and then frozen to use when they're out of season and more expensive. I keep this price list mentally, but the way my memory is lately I might start keeping an index card or two in my coupon binder.