It's called Woodman's Market https://en.wikipedia.org/wiki/Woodman%27s_Markets. Mostly in souteastern Wisconsin, and some in northeastern Illinois. My favorite part of it is the fact that you don't have to take the food out of your cart, put it on the belt, then take the bagged groceries and put it back in your cart again. The front of the cart flips down, and it gets pulled up in front of the cashier who can either bag it after ringing up the items, or typically there is a dedicated bagger.

It is really fun to take someone there who has never been in one before, and watch as they get overwhelmed. Just the fact that there are 3 aisles of frozen pizzas... and the cheese coolers run at least half way down the width of the store.

Oh, and the employees are friendly -- I wonder if the fact that it is employee owned helps there (or how the employee ownership works).

Edit: do a video search for Woodman's, someone has posted a video of traveling the store on a scooter, you can get a good idea of the size of it.