I always look at the labels and check the "price per xxx" when purchasing things. I have found that in my local grocery (a big chain owned by Kroger), that it is often times cheaper to buy the smaller size box than the larger size box. That is counter to the way things have traditionally been, and IMHO it is because the groceries are trying to make profit off of peoples old ingrained purchasing habits.
Warning: Don't apply the above observation to Costco. There, you usually do get a better price per xxx by buying the large size. Of course, their "large size" is a 55 gallon drum of ketchup, but if you can handle that, it's a good deal.
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