What about that new thing that Microsoft released the other week - that origami project thing.
http://www.engadget.com/2006/02/24/m...igami-project/
http://www.origamiproject.com/
Isnt this kind off what you looking for?
No idea about the price though bud!
Also have a look here:-
http://www.microsoft.com/windowsxp/umpc/default.mspx