Distributors? By all means, point me in that direction...
...or are you talking about the online or mail order shops?
For the most part, they're one and the same. Classic Arms, AIM Surplus, Southern Ohio Gun, and more. They carry C&R stuff as well as other non C&R guns. While they may not be the full up distributors like those of new guns, they can carry a large selection of used guns (like police turn ins).