Have you heard of Shop Runner?
You've probably seen their logo all over online stores like Toys R Us, Drugstore.com and American Eagle Outfitters.
They offer free 2 day shipping on most items at select retailers with no minimum spending amount.
The annual fee is normally $79, but for a limited time (thru 12/31 or while supplies last), you can get a year FREE! Go here and use offer code RUNNER. It will be the first field you fill in. Credit card information is optional. You do not need to fill it out.
You can also turn off the "auto renew" through your account settings.
(Thanks, Mojo Savings!)