Hi Bruce
The ToUcam can still be bought - the 900nc is available from a few ebay stores and also from
telescopes-astronomy in South Australia.
It's still probably the best budget one around.
However the next step up would be the D*K series from
Astronomy Cameras.
The DBK is best for a 1-shot colour camera, and the DMK is best if you want to take the extra step and go a monochrome camera (obviously you'll need a filter wheel+filters to get a colour image).
The D*K's have faster framerates, no compression and are more sensitive.
Good luck!