Update! This works on Wal Mart gift cards! We ordered a $25 gift card 3 separate times and got a ShopRunner 1 year membership ($79 value!) the first time and a $5 statement credit the second and third times! Go here to shop Wal Mart!
Go here to register for their "gift chain" and you'll get a shot at a free gift with a $25 purchase from the following stores:
Eligible stores are:
American Eagle Outfitters
Bed Bath & Beyond
Rue La La
And of course, you have to use your registered AMEX card to get a gift.
There is a limit of 10 rewards per card.
The success rate looks to be fairly decent on this! They're giving away things like $25 gift cards, $20 statement credits, $5 Starbucks cards and more! If you're shopping already, this is just another bonus!