Go here: http://www.facebook.com/ads/?src=advf2 and click manage your existing ads. Then click on the “Billing” at the top of the Ads Manager. Then click on the “Funding Sources” tab on the Billing Summary page. Then enter these coupon codes:
2JXY-WTFK-72Y0-VJ6Y For the last one, which is $100, you have to add this application:
As soon as you add it they will email you the coupon code.