People who shop at Costco often enough are usually encouraged to upgrade from a basic membership to an Executive membership. The obvious downside of Costco's Executive membership is that it costs twice as much as a Gold Star membership -- $130 a year vs. $65.

For just $130, not only do you get a year of exclusive Costco goodness, but you’ll also receive a $45 digital Costco Shop Card.

The warehouse store chain's Gold Star Membership normally retails for $65. For the next few weeks, shoppers can purchase a 12-month membership through affiliate marketer StackSocial and receive a $45 Costco gift card, effectively reducing their annual rate to $20 for their first year.

An upgraded warehouse club membership could put cash in your pocket. But should you choose Costco or Sam's Club? Read on to find out.

Right now, Costco is running a limited-time deal through Stack Social that’s so incredible, one shopper said it seemed “too good to be true.” While you’ll still have to sh