You could try doing it your self.

I know some builders that made their own and achieved good results, specially Nick, from Australia, Scissorhands builder. There are loads of information on his forum topic: http://www.robowars.org/forum/viewto...asc&start=2460, beware the topic is huge and information about wheel casting is mixed with lots of other stuff.

Nick is a very accessible person, so if you need just drop him some lines on the Australian forum.

I intend doing something similar for some of my designs. The price is better if you intend doing lots of wheels.

Just buy PU (Polyurethane) resin and the appropriate hardener, make some molds and start batching

Cheers,
Eduardo