I do have a spreadsheet--with way too many things on it to fit into one page. I could make a one-page version, but currently I have no printer.

I used to go to one store per week unless I was going somewhere out of the way, then I would also go to any stores that were convenient to that out-of-the-way place, so my think was almost just like you describe (except I would stock up on the way cheaper stuff and then just make do for a while until it ran out). However, Robin would go shopping every day if he could, so we are always going off somewhere or other. So it's not quite so important to stock up anymore.