Numrich is probably your best bet to find specific parts for it: http://www.e-gunparts.com/
The thing is that these guns can be had for under $100 a lot of times or not much over, and that's for ones that work properly. At least without as many issues. Don't get me wrong, I like them a lot and collect them but what the gunsmiths said was correct. With what they'd charge you'd probably be able to get a couple of them....maybe. At least another that does function. Don't be discouraged though. A lot of stuff on these old revolvers can be done yourself, as far as replacing broken parts goes. You just need a lot of patience when it comes to some of the springs and getting it all back together.