Touch Screens For PCs?

solmssen asks: "I've decided to take the plunge and build a system into my car to play MP3s, light e-mail and browsing, and GPS mapping. I have a lot of stuff I'd like to use already, like a Netwave basestation and PCMCIA card that will allow me to access the filesystem when the car is parked at my house, a Ricochet modem for access on the road here in L.A., a GPS receiver, etc. What I lack is the central unit. I've done all these things with my Sony 505, but I'm loathe to give that up to this project. I'm thinking instead of an older 486 or Pentium touchscreen "Pad-Style" computer. These used to be advertised 3 or 4 years ago - I can't seem to find one on the refurb or used sites I know about. It would need to have PCMCIA slots, a serial port,and a 2.5" hard disk I could replace with a 8-12GB unit. Any thoughts? I used to get catalogs with stuff like this in them, but I can't find anything out there right now." Anyone have pointers as to where you can find them, online or off?