WalMart Superstore. I live less than five minutes away and the place is open 24 hours a day. Plus they will match prices from other store's flyers. (If you don't like WalMart, don't feel you need to enlighten me. My friends are already sharing the propaganda.)
I found that it helped to make an online list of the products I use, including the few that are brand specific. Some can only be found at one of the five markets in my area, so I note that down. And I keep track of the price.
One market has high prices but great specials. So of course I go only for those.
And once a month or so I go to Trader Joes. The stuff I buy there (like the frozen veggies) are so much better than what is available elsewhere that I really stock up. I eat WAY more vegetables when I have a freezer full of TJs!
And I learned to cook beans 400 ways when I was a college student. I love them and because I'm eaten them for years, they agree perfectly with my digestive tract!
There are many paths up the mountain but we'll all reach the peak if we just keep climbing.