I get the allure, but it's not for me and my partner. We live in a small apartment. We drive a small car. The pantry has a good amount of dry bulk & canned food, but we largely shop one week at a time. Sure, we could "lock in" on two or three foods, buy weeks worth of them at a time, and save some money. But like most people we like a bit of verity. It's just not possible to buy such massive quantities of things with…
Trader Joe's is probably closest to what you want. It targets single shoppers with small quantities and low prices, and it rotates products frequently to keep things interesting. Anecdotally I feel like a lot of TJ's shoppers shift into Costco shoppers as they age up.
We're a bit odd though. Highly budget conscious, 4 kidsto feed (including 2 teenagers), and European tastes in food.