your easiest bet is an open frame monitor (like the Elo's we all got in on). If you think you an work around it and build a custom mount, I saw a NEC 1560V touchscreen on ebay just now for like $100 + shipping which isn't terrible. We all basically got steals. Retail on these things is still in the mid $300's and up.
Basically, be patient, don't get in a hurry, and wait. Get measurements from the web for the monitor you think you might look into (basically one size for most open frames and then one for the standard 15" monitor), build around it to keep you busy and then wait to pounce. If they were there once, they'll be back again.