Buy $100 worth of Simon Mall American Express gift cards and you get a free $15 gift card. The fine print lists Lowe's, Darden Restaurant, iTunes, or an American Express gift card.
I bought two last night because I had some bills to pay and shopping to do and it's basically as good as cash. The fine print says one per transaction but the guy at customer service had no problem ringing mine up separately. I chose Lowes, but if you choose the $15 American Express card you should ask the customer service associate if the $3.95 charge will apply to activate it. My cards were $103.95 each because I paid with a debit card. If I paid cash it would have been $102.95. So you basically get either $11 or $12 for free. If you plan on making a large purchase or paying your mortgage or any bills it's well worth getting the cards to pay with.