Attention, Costco shoppers: If you and your pals love Costco but balk at the annual fee, sharing a membership card may seem like a sneaky work-around. But a big change is coming to Costco warehouses ...

Costco is tightening the way shoppers get in and out of its warehouses, and the change is more than a small tweak at the door. The retailer is leaning hard into membership verification and receipt ...