I'm not sure if all the drivers would be available, but I know where there is a Sun nforce4 based PCI-E/PCI system for sale for under $50 with a 2.2 GHz Opteron processor and shipping is only about $20.
You would probably want to replace the video card and i don't think it has a hard drive (I can probably send you one of those (it uses SATA II drives).
Edit - Correction, there are two, one as stated above and a second for under $51 with free shipping.
They don't have memory or hard drives (but I have both).
Jim
