Thats not so hard, just buy a 2nd videocard for a PCI bus and use SoftTH to do triple monitor functions
with SoftTH you dont need multiple good videocards, only the middle screen need to be good. like i have a shitty FX5200 for side screens and still play Crysis(DX9) on Highest Settings at ~40FPS.
If the game is not supported by SoftTH, play on 1 monitor and have Skype+Msn+Loads of other shit running on the side monitors
Total costs: $~30
which is still better then paying $280 for a TripleHead2Go xD