I have the following used Dell PE 1600SC for sale:
MidTower Dell 1600SC
2.0 Ghz Xeon 512K cache 533 FSB
60 GB Maxtor ATA HD
(2) 513 MB memory
Floppy (yea, it's got a 3 1/2" floppy)
Shipping is $60 for FedEX ground anywhere in the lower 48. Yes, I know that is a lot for shipping, but this thing is really heavy. It weights aprox. 60 lbs. Payment is by PayPal. I'll only sell it to people in the US.
We used this box as our Nagios monitoring server. It's been working faithfully for may years. It was decommissioned last December.