I've got an extra Dell PowerEdge SC1435 up for sale for $700 OBO shipped to any DC. It's currently in FDC Chicago so if you want to keep it there arrangements can be made.
1x AMD Opteron 2356 (2.3GHz) Quad Core (2P unit so another Quad Core could be added)
4x 2GB RAM (8GB Total) Upgradeable to 32GB
2x 640GB WD HDD
10 foot power cord
Warranty expired on January 2010 and you can re-up it before then if you'd like. It's NBD onsite.
If you have any questions, feel free to ask me. It's a very nice server, I just don't have a need for it right now.