best to look on Craigslist. I found 2 professional viewsonic pf 225 crts for 50$ a piece, then later on I found a Sony fw900 but it had a huge scratch dead center of the screen = declined it. but there are good deals to be had on Craigslist. just be careful dealing with people on there.
Rig1: Xeon X5660 6core 32nm @ 4GHz, Asrock X58, GTX 670 FTW, Samsung 128Gb 840 Pro, Vertex2 100Gb, Cherry MX Reds, 2009 Seasonic X 650w, Aluminum Full tower
Rig2: i7 970 6core 32nm @ Stock, EVGA 760 Classified, Nvidia 0db 210, Elpida Hyper CL126.96.36.199, Samsung Evo 120Gb, Vertex LE 100Gb, Cherry MX Blacks, Sidewinder X3, Enermax Revo 950w, Obsidian 800D - F@H machine