The Amazon-AMEX promotion continues if you haven’t already taken advantage of it. Coupon code AMEX17EVER gets you $25 off an order of $50+ of products sold and shipped by Amazon itself IF you pay with an American Express credit card that is part of Membership Points and if you pay at least partially with Membership Points (you can pay as little as you like). I just did this promotion today and it still works. Gift cards are eligible as well (just not Amazon’s own gift cards).
For more, check our previous more detailed post.