Well I've started making bellows, but I'm not taking orders yet
Just made some for my Quarter plate camera, and tomorrow will be making a set for my De Vere whole plate (half plate/5x4) monorail, the patterns been ready for a couple of weeks. Total cost will be approx £10 ($14). It's not too difficult, just a little time consuming.
For a bit more DIYcameras offers a very reasonably priced kit.
Custom Bellows, Birmingham UK, though with make you the genuine bellows, they manufacture the OEM bellows for virtually if not all the European manufactures.
Ian