That's a tough poll for people who live in areas that don't have all those chains.
Around here, we have Stop and Shop, Trader Joe's, Big Y, Hannaford's, and Whole Foods.

I shop for staples at BJ's wholesale club where you have to buy in bulk, but I have a deep freezer so it's ok.
Then I get as many veggies as possible from local farmers markets and freeze those too for out of season
All my odd little yummy treats come from places like Trader Joe's, Asian markets, and this weird discount place in town that I call the 'used food' store because everything expires like THAT DAY, lol.
I absolutely REFUSE to buy food at WalMart.