In general. Do you have a list of the top of your head?
Costco: in bulk: flour, rice feta cheese, beer
Bingo: their brand items may be a better price than kosher branded items in any store.
KRM: IDK what's a better price. I like the feel of the store; I've been shopping there for 30 years. They have helpful sales people. They carry my hechsher meat. The milk products are the same price as Bingo.