*GONE for today* Mastercard - Pays you $20 (expires 12/31/11)

Do you have a MasterCard credit or debit card? If you do, you can visit MasterCard.com and register your card. When you spend $200 online between when you register and December 31st, you will get a FREE $20 giftcard via snail mail.

You could use it to purchase Amazon giftcards or use it to pay a bill online too and still qualify for the $20 giftcard. Go here to sign-up.