Some repair parts are available but knowledgeable gunsmiths for these older S&W's are close to nonexistent. An example: "...except cylinder rolls free... If a cylinder stop is needed, the cost is close to $70 if you install it. And it will need to be fitted as it is oversize and not a drop-in part.
I rebuild these broken S&W's as a hobby and have five on my desk now. Most are awaiting parts. Some have been on my desk for years. I'd buy that revolver for $150 if I was going to repair it.