It’s a service that gets you free 2-day shipping with no minimum order size and free shipping on returns at a variety of (“80+”) online merchants. That’s great for savings in general, and it’s great for mileage-earning deals. Often you can get great mileage shopping portal deals for buying through various stores, but the cost of shipping can reduce the value of the deal — but Shoprunner saves the economics.
You’ll have to provide an American Express account number to verify eligibility, and then create a Shoprunner profile. It appears that once you enter your American Express card number that you can also apply the benefit to an existing Shoprunner account if you have one.
I’ve used Shoprunner in the past to get free shipping on very small purchases from drugstore.com and still earned points for those. I’ve seen free one year trial offers, but never before an offer of free lifetime membership.
(HT: Do It for the Points)