American Express "Offers for You" can really add up over time so make sure to check regularly.
If you have the offer on multiple cards, don't connect it to one of the cards right away. Open up americanexpress.com in separate tabs and get the offer open on all of your cards, then click on the offer for all the cards. If you don't do this, the offer will disappear from your other cards one you click on it once. I was able to get the Costco offer on three separate cards so good luck to you