American Express card members can currently get a ShopRunner membership completely FREE, as long as you keep an eligible American Express Card as your default card in Express Checkout at ShopRunner!
When signing up, you will be asked to verify that you are an American Express Card member by filling out a form with your American Express card info. You will not be charged, this process is just for verification purposes.
You can use any of your American Express Consumer or Business credit cards or charge cards. Prepaid cards such as Serve, American Express Corporate Cards and American Express-branded cards (Such as the Travelocity Amex) or account numbers issued by other financial institutions are not eligible.