Chase Southwest Rewards
https://creditcards.chase.com/6000329

You need to spend $2,000 in the first three months and if you do so, you will get 50,000 reward points. The Reward points can be cashed in for Amazon Gift cards (50,000 points will get you $500 in gift cards). Keep in mind there is a $99 annual fee, so you should be able to clear $400 doing this - and then cancel the card before the year is up