Depending on what it is, this is my short list:
E Proto (great appearance models, I use them all the time)
All Jack (low to medium volume manufacturing)
Dutch Group (good appearance models through to low vol manufacturing)
Hemtom (good appearance models)
Image (great appearance models)
Forecast 3D (3d print, additive metals, 5axis CNC, and urethane casting facility with some post finishing capabilities, but only a few miles from me)
Shoot me an email Jon if you want me to send you email contacts to any of these.