Someone who has bought things on eBay with an American Express card may have a $5 off $15 promotion available.
Use code AMEX2021 during checkout on your account that has an American Express card saved, and you may get $5 off.
When purchasing a Buy It Now item, Add to the cart. Do not click "Buy It Now" On the checkout page, Select your American Express card as payment, and Enter code AMEX2021 in the "gift cards, coupons, eBay bucks" box. $5 discount should appear. If not, sadly, you are not eligible for this promotion and you can close the page without buying.