For a while now I have been using desktop computers that we have pulled from production for test servers. Mainly because they are free. The problem has always been that they are not servers! They always seem to have slow processors or not enough RAM to do what I want.
So, I went Ebay shopping! I was able to get a Dell 1750 with a 3 Ghz Xeon processor and 4 GB of ram for just $560. Better yet, the seller is based in Grayslake so he has offered to deliver the server for free!
I haven't gotten it yet but I plan to set it up with VM Ware and attempt to virtualize a few legacy servers to start. I'll post more when I get it set up.