Costco’s introduction of membership card scanners at the front of US stores is still rolling out, but the move is already paying off big for the wholesale club.

Costco's decision to install membership card scanners in U.S. stores could lead to the retailer's own version of a "Netflix moment," according to Morgan Stanley analysts.

Don't miss this deal to buy your own Costco membership and get a $20 gift card, effectively cutting the price to $45 for the year. (I bought one and highly recommend it.)

If you’re shopping alone with your partner’s Costco membership card, you probably can’t even enter the store, as Costco now has a stricter policy. Costco (COST) is tightening entry rules to prevent non-members from sneaking in.