My state has two main supermarkets, and they're both overpriced. Market Basket is trickling in from the South and I patronize them heavily, even though they're out of my way. The overpriced supermarkets are the inflation creators-- they just randomly jack prices up on half their stuff, with no corresponding blips in the wholesale price. I absolutely understand people shopping around. They should also try Aldi.
BJs and Sams Club charge "retail" plus a fee for the privilege of shopping there. I'll get a BJ membership for $20 or $25, on sale, let it lapse, and renew it when they invariably want me back after a few months. But that's just for the loss leaders, like those giant kegs of peanut butter filled pretzels, 3 lb coffee cans, and Propane, LOL. I don't buy most of their bulk stuff, it's not cheaper per unit. Sams Club even has the gall to limit purchases to two items per customer. It's a warehouse club!
I had a Costco membership exclusively to buy a QuickJack 5000 for hundreds of bucks less than anywhere else, with free shipping. They're coming, in a week, to Scarborough ME and I'll be there for some Kirkland 0w20.