Costco's Executive membership gives you 2% cash back on purchases. But there are rules for where you can spend that money. Read on to learn more.

Costco offers two tiers of membership to choose from. You could pay $65 a year for a basic Gold Star membership, or upgrade to an Executive membership for $130 a year. The Executive membership gives you the benefit of 2% cash back on your purchases in exchange for the higher price.

Have you heard of Costco's other members-only website? If you haven't, well, you have now. Here's what it's all about and how you can shop there.

Thinking about upgrading to a Costco Executive membership? Make sure you know about the possible drawbacks before you do.