I picked up ane Aiptek for about €50 on Ebay. I realise it's not as good as a Wacom, but I only need it the odd time, so it does me fine. It has the pressure sensitivity, overlay, etc.
I know Wacom released one that is an lcd touchscreen you draw on recently, and that is big bucks. Does anybody know how much better the regular Wacom tablets actually are, compared with the consumer offerings?