There are tons of 120hz LCDs. Some of the korean models that you can pickup for $350 can be manually set to run at 120hz but you have to be lucky. They run at 2560x1440.
Most 120hz LCDs run at 1080p though, and you can typically buy them at Newegg or wherever you usually get computer parts. You should be able to find dozens of models by Googling for "120hz LCD monitors".
A popular one is: http://www.overclock.net/t/1374065/korean-qnix-qx2710-evolut...
Most 120hz LCDs run at 1080p though, and you can typically buy them at Newegg or wherever you usually get computer parts. You should be able to find dozens of models by Googling for "120hz LCD monitors".