I used to but then quit. Was just thinking of starting that up again as the prices are all over the map from one week to the next!
For instance, eggs have been $1.49) Now .88dz. Huh? I like those door busters tho. Keep 'em coming.
When I did the price book I just did my regular shopping one week, kept the receipts and began keeping track on a form on my computer. The form included: date, item, price, store where bought. Easy to begin a price book that way.