Add a touchscreen to a Laptop.

I have a Cr-48 Chrome OS developer PC with a Windows 7, Chrome OS, Android Honeycomb, and Ubuntu quad-boot. To use Android I use the trackpad, but I was wondering if anyone knows where to find an appropriate digitizer. It is a 12.1" screen with a 16:10 ratio. It would more than likely need a USB connection. The touchscreen would mainly be used for Android if possible, but also for Win7 & Ubuntu. I am very eager about this project. Please help!