Download their app on your smart device. Go to offers and several local and nationwide things pop up. Amazon was on there until dec 31st. You may be able to do it via their website also, I dunno.
Also: to anyone who has the card, if you haven't used your $200 airline credit this calendar year, you only have a couple of days left to use it. With most airlines, you can purchase gift cards in $50 or $100 increments and it will credit your account. Go to flyertalk.com for details and to see if your airline that you chose allows it. I did it with AA. You can turn around and do it again January 1st and have $400 total in airline gift cards that you can use for airfare, etc.
I just really haven't had the time to go look into this, so figured I'd ask here... That $200 is for one specific airline, correct? I bought myself a "hearty" sandwich on my way home this holiday season while flying Delta, but after the fact, I realized that I think I have United as my airline of choice for AMEX. Am I mistaken or do I need to "eat" my $9 sandwich (which is probably more filling than the actual sandwich)?