Gallatin County had an "IT Surplus Sale" today. I picked up a Dell PowerEdge R710 2U server for only $50. It is a complete, functional system except they removed the hard drives... so I'm going to have to buy some. A new 4TB 2.5" Seagate Constellation ES SAS 7200RPM will set me back about $180.
18 DIMM sockets, 6 populated with 2GB (12GB installed, 288GB max)
8 2.5" hard drive bays - empty, first two have to be SAS drives, others can be SAS or SATA
Perc 6 / LSI Logic / Symbios Logic MegaRAID SAS 2108 RAID card
2 quad-core Intel Xeon E5620 @ 2.40GHz (combined BogoMIPS 76803.42)
6 GBit ethernet ports (4 onboard, 2 on a descreet card)
2 Riser cards with 2 empty slots
Dual power supplies
With only 12GB of RAM, maybe I need to buy some more RAM. Here's how much the various sizes of DDR3 1600 ECC DIMMs cost:
4GB DIMM - $48, 8GB DIMM - $65, 16GB DIMM - $118
Not too bad for $50, eh? They even threw in a Dell PowerEdge 2950 2U server for free with it.