okay, that one didn't get erased, so now I'll do price books
I have a small 3-ring binder from the thrift. I bought a calculator that clicks into the rings for the front. Every food I buy has it's own page that are alphabetized. Under each food name, there are columns for: store name, brand, quantity per price, and price per each (lb, oz, etc.). I jot down the info as I go to different stores, also from the mail co-op. Even though Walmart is usually the lowest price, this allows me to search for sales that are cheaper than the Walmart price and then buy in bulk. I record even the stores that aren't the cheapest like Albertsons b/c their sales fliers usually don'tive exact prices, like, "30% off all frozen foods" or "Buy1/get1free butter". Then I can check my PB to find out what the original price is to know if the sale is a good deal or not. I take my PB to Sam's Club and BL b/c their products can vary often. Here is a page from my book:
(WM=Walmart, SB=store brand, DNF=local health food store, TCW=mail order co-op)Raisins
WM SB 24 oz/$1.96 $1.31/lb
DNF bulk --------- $2.00/lb
TCW bulk 10 lb/$12.33 $1.23/lb
Sam's Sunmaid 72 oz/$5.26 $1.17/lb
Since I've yet to see raisins go on sale we buy them only at Sam's. As with all of our shopping, we buy enough to last until the next sale, or in this case, until our next pilgrimage to Sam's Club.
Hope that helps! If I didn't explain something well enough, please ask!