I had touch screens installed on LCDs purchased from Apollo Displays:
http://www.apollodisplays.com/

Click on DISPLAYS at top left, I chose mine in the PASSIVE GRAPHIC selection.

Click on TOUCH SOLUTIONS and then TOUCH SCREENS for some generic bla-bla.

I think I had paid $19 for the LCD and $10 for the touch screen, installation included. Now all I have left to do is to figure out how to make this sucker work. Nearly there...

Robert