Ebates has temporarily increased the payout rate for American Express gift cards to 2% when using their mobile app. There is no expiration date listed, but increased payouts generally only last a day or two.
If you don’t already have a Ebates account, you can find a signup link for Ebates and many other cool things here.
- Do not use a promo code to reduce gift card fees or for free shipping since that will invalidate your cash back (the Premium Shipping Plan is fine, though).
- Do not buy denominations higher than $2,000 (see: $2K denomination limit on Amex gift card cash back)
- Do not pay with Citibank credit cards since they sometimes charge cash advance fees.
Please see the The Complete Guide to Amex Gift Cards.