3D printing / prototyping services?

I have a concept for a board game that I'd like to produce a prototype of. I've already made to-scale CAD models of all the tiles and pieces I want produced but was hoping to find someone with experience ordering this kind of thing before jumping in. Ideally I'd like to find a range of options - very cheap prototyping which I'll hand-paint/finish myself is at the top of the list for now though.