Building Your Own Tablet PC?

GuNgA-DiN asks: "I would like to develop a prototype system for the Educational market using tablet PC's. I need to buy a few tablet PC's (with docking stations) and built-in wireless capability. Does anyone know where I could buy a barebones tablet PC kit? I don't want to spend $2,300 on one just to test out my idea. There are plenty of options available for end-users with pre-installed operating systems (read: WindowsXP Tablet edition). However, these are very expensive and will never make it to the low-cost Educational market. I need a barebones, build-it-yourself developer's kit that I can use to experiment with."