Vente Privee is kind of a fancy Groupon-like deal site that sells designer things in 72-hour sales. They are offering a $20 statement credit with your first purchase (no minimum requirement!) with an American Express by 12/31. (American Express is an official partner.)
Here is the offer: https://secure.us.venteprivee.com/vp4/Registration/Registration.aspx
As mentioned the sales rotate each day, not bad for some free stocking stuffs. Many of the cheap items sell out fast.