Does It Still Work With Costco?

Costco doesn't accept MasterCard in-store, so you have to use a Visa card. So you could buy anything off Costco.com, have it shipped to your house with a MasterCard-based credit card, and go into the store to return it. But because they don't accept MasterCard in the store, it's called a forced return. They have to return the card back to a different card, because their systems wouldn't allow it.

Meaning, you could just continually buy thousands of dollars worth of stuff, getting a 2 or 3% multiplier on that. So it might be like you buy five brand worth of stuff and a 3 or 4% cash back card, you're getting $150 net. getting $150 net. That method works at a ton of stores.