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 X5690, Asrock X58, Geforce 210 0db, 120Hz 27" 2ms Asus, Cherry MX Blacks, Samsung 128Gb 840 Pro, Vertex2 100Gb, 8x1TB Samsung F3 on a Lian Li HDD Power Controller.
Rig2: Xeon W3690 @ 4.4GHz 1.32v, HK 3.0, Swiftech MCR320 Drive Rev3, EVGA 760 Classified, GTX 670, 144Hz 24" 1ms Asus, Cherry MX Reds, Samsung 840 Evo 120Gb, Vertex LE 100Gb, Creative Zx