Aldi's - prefrozen chicken, veggies/fruits, dairy, snacks
BJ's - on free trial membership, paper goods, condiments, some frozen prepared food (potpies, meatballs)
American Legion - join up with other members and the post itself to buy in bulk from Sysco or Deli Boy.
Dollar type stores - canned and dry goods
My container garden on the back deck - herbs, tomatoes, peppers, peas, green onions, leaf lettuce, beans in season
Micellaneous local stores - Mr B scans the newspaper grocery store flyers for sales while he has coffee with the Legion guys in the morning. They do the same "research" and tell each other about the best local deals. It's like having a Shoppers Club with no fee or silliness.
WalMart is at the very bottom of my list, if at all. I have personally seen people sample food from sealed containers and place them back on the shelf. That just grossed me out and destroyed my confidence in their food safety.
Coupons? Not since I was a newlywed and we bought the house in 1984.