Bummer!
This place has a 500watt "titanium" version for about $20:
http://www.buypcdirect.com/dept.asp?dept_id=24-004
Here's another place with something looking similar for about $19:
http://store.yahoo.com/dealsurprise/po50dufanatx.html
Perhaps this?:
http://www.dealsonic.com/po50atxp4amd.html
Looks like a nice inexpensive (and well-laid out) PSU to work with. Do you know how clean the voltages are? I might look into getting one of these babies.