Sale ends tomorrow if you"re interested. There"s also a 525 watt for an extra $10. Even with taxes and shipping it arrive at your for around $50
Cooler Master Extreme 2 Power Plus 475W ATX 12V Energy Star Power Supply 20/24PIN 120mm Fan Cooler Master Extreme 2 Power Plus 525W ATX 12V Energy Star Power Supply 20/24PIN 120mm Fan
Edit: I just looked at the review, maybe these wouldn"t be a very good choice.