Re: One off CNC Parts? Who does them?
I'm not local, but I am a mechanical engineer by profession and do these sorts of things all the time. You can do a Google search for local machine shops or maybe some guys here know of some. People in the automotive/racing business often are knowledgeable about good shops as well so you can ask/call around.
Contingent on the complexity of what you are trying to do will dictate the type of machine that is needed to make it(this will also play a role in which shop you choose). If it is pretty straight forward, almost any shop can do it (most gunsmiths probably could as well with a mill and lathe). However, if the geometry is complex, you will require more complex equipment such as 4th and 5th axis CNC's, EDM, ect., as well as special tooling and the proper metrology equipment to verify dimensions/tolerances.
The material you are specifying can be problematic as well if it's something more exotic than your basic aluminum alloys and steel variants. Machining things like titanium and beryllium can be hazardous and some shops avoid it.
You will need to provide a sketch or drawing and depending on complexity, they may have someone at the shop model it in 3D CAD if it's going into a CNC so they can program their process routers off the solid model. Be mindful of your tolerances/stack-up as well. If you talk to a knowledgeable machinist and tell him what you are trying to do, they will certainly be able to help you with this.
I have access to 3D CAD and Finite Element Analysis tools and can model something up for you if you need it (could save you a little $ if the shop decides they need it).
Hope this helps and good luck!
Thomas