http://gamerdeals.net/blogs/cheap-ps3/archive/2009/03/11/sony-offers-200-credit-on-349-purchase-w-sony-card-thursday-saturday-only.aspx
you've gotta get approved (instantly) for a sony credit card. you get 200$ credit on any purchase over 349, including ps3s.
there's a catch, of course - the 200$ isn't posted to your account for 8-12 weeks, and then it's only as a credit to the card, to entice you to buy more games. but if you can wait the 2 months for the credit, you'll get a ton of money back.
it's only thursday through saturday. so, if you want one, get on it.