I have a Dell Poweredge 2400 server that I used to use, dual P3's, (I think) a gig of ram, and a Mylex hot swap raid array. It has four 18.2 gig drives and the config for the drives is in hardware, so you can do 0 thru 5. boot CD and 3.5 floppy too.
$50?
I'd need to wipe the drives first to get all my pr0n off but let me know if you're interested.
I believe the CPUs are 800mhz, not sure. It has been a while, I was using it for httpd and mail only, and a few lists. Not sure which Windows/Linux systems it is compatible with, you do your research. I had Win2k running on it.
Obsolescence is worse than death. Seems PC values drop faster than those of Monsters! ;)
I have a Toshiba Satellite Pro that I use as a doorstop. It was $2k, state of the art [in 1998].