The TrueEarning Card from Costco and AMEX is a great card to have if you're the one holding a Costco membership already. Even if you don't have a Costco membership, you'll be able to use this credit card as your way in. So, if you want to save on everything in bulk, plus you want to save on great things like gas, and groceries, this will be the card for you.

This particular card is going to allow you to save on just about anything, no matter where you go. You can save up to 3% on gasoline up to $3,000 per year, as well as 3% at restaurants, 2% on travel, and 1% on everything, including your purchases as Costco. It's a win-win, if you love to save, and you're good with your credit cards.

As long as you pay your card off in full, you'll be able to reap the rewards. Since you won't have to pay any interest rates, if you do pay it off in full, you can almost get a sale every time you swipe your card. If that's not enough, there's no limit on the cash back earned!