Take a cart, always over $100.
I could use a cart, but having a cart makes navigating around the warehouse 10x slower. If I'm just carrying stuff under my arm or in box, I can walk quickly, I can walk around people, and I can get the the self-checkout aisle and GTFO of the store without taking an hour...
In the age of private equity takeovers and the MBA-enshitification of pretty much every product and service, Costco appears to be the only retailer that will stand on the side of their members against those forces.
They are playing the long game--which will pay off incredibly well for them as fewer and fewer companies care about customer satisfaction and quality.