Here's something I stumbled across, just for future reference. My dad had surgery earlier this week (elective, and he's doing fine), his hospital room had one of these on the wall. It's a 20.1" LG, apparently made specifically for hospitals:

Crappy picture, I know. Sorry. Here's the model info (LG 20LH1DC1):

The screen was pretty good, and the size looks excellent for a 4:3 arcade project. Quick Google shows none for sale (even used), but it's something to keep an eye out for in surplus sales and such...