Re: looking for an extremely cheap tablet pc
You could just get a wacom tablet for your pre-existing PC.
Cheap tablets don't exist. The cheapest one you'll find is probably a Lenovo X61t, and that's still in the $1k range.
ASUS Rampage Formula X48, 4GB Corsair Dominator DDR2 900, Intel X3350 @ 3.6ghz, 300GB VelociRaptor, 500GB Barracuda, 2x 4870HD 790/1100, 850W Zalman PSU, Antec P182