Parts are about the ONLY reason I go to Gun Shows anymore. There are a couple a year I attend and two vendors routinely have parts segregated into many of those plastic divider boxes. Many of the parts are used but some are Factory new and never saw the inside of a gun. The prices are not great, but hey, when you need something and they have it - you buy it. They also seem to have parts for Colt's also and over the years I've put a nice collection of spare parts together to keep my collection working for a long time to come. I don't go binge buying crazy but I always like to have common parts that do wear out like Hands, Hammers, Triggers, Screws, and Springs. A few extra sets of common Grips never hurt either.
I like the ability to repair a broken part and get a Revolver back into tip top condition immediately and without having to be at the mercy of the on-line parts sellers. I also like to hand select parts that are not worn more than the ones that I am replacing! It's also nice to SEE in person and make sure you are getting the correct part or variation for your exact Revolver. When someone picks out a part for you on-line it is sheer luck if you actually get exactly what you want.
I suggest attending a few of your local shows and see if they have Parts Guys there.
Good hunting!