I try to do it all on one day of the weekend. Usually about 2 stores. I rotate the stores to get the cheapest price on some items. For example, I go to Trader Joe’s about once a month to get reasonably priced tempeh, canned soup, and organic sweet potatoes. I tend to spend less if I make it a rule to not buy food unless it is weekend. I don’t always keep that rule. 🙂