I’ve actually found that Target groceries are cheaper overall than the major grocery store chains, even the shittiest ones. I live in a major U.S. city so ymmv. The only big chain that beats Target’s grocery prices is Walmart. But you have to psych yourself up to shop there because it’s always a hellscape and I’m usually too tired for all that.

Aldi’s/Lidl/Trader Joe’s are also always very economical but they have a limited selection of items.