Speaking of ebay. I was just looking for 4U supermicro deals, and came across this.
Supermicro Server 4U with RoHS H8DGI F Rev 1 0 Motherboard and 16 Core CPUs | eBay
It's from a seller with very little rep, but the specs are amazing. 2 Opteron 6376 (32 cores total) on H8DGi-F in 36bay...