It may feel sneaky, but it's totally legal. Here's everything you need to know about the coveted Costco Cash Card.

Costco Shop Cards can be used by members and non-members alike to shop at the warehouse club's stores and online.

That's right, there are ways to shop certain products at Costco without a membership card. Be warned, however: These tips and tricks aren't the silver bullet they may seem to be. Costco has cracked ...