Might be too late but this site is very cheap for timing belts, lots of pulleys too:

http://www.fish4parts.co.uk/Mechanic...-Belts.109413/

I've got most of my belts from them.

My Vertex HV6 rotary table works well as a 4th axis. I just made a mount for a 1nm motor on to it from a piece of 3" aluminum bar - not difficult to do at all. Wear on the worm drive might be a problem though.