ShopRunner, the 2-day free shipping service, is offering a free lifetime subscription for American Express customers. It has to be a credit card, as rebate debit cards will not work. Currently ShopRunner is available on  89 web sites. Some well know sites the service is offered on include Newegg, Tiger Direct, MacMall, Radio Shack, Auto Zone, eBags, American Eagle, Calvin Klein, Tommy Hilfiger, Toys R Us, and many more. If you're already a subscriber you'll get a pro-rated refund. The terms state that "To maintain this benefit on your ShopRunner account, you must keep an eligible Card as its default payment method in Express Checkout. The benefit may be cancelled on your ShopRunner account if you change your default payment method to anything other than an eligible Card." Do note that the service is not offered on all products available on each site but only certain items. For example heavier items on Newegg like computer cases are often not eligible for ShopRunner.