I stumbled on this fantastic link today — it will lead you to all 480 GUNSMOKE radio shows in absolutely pristine listening condition (as well as the two pilots). Not only that, but there's also tons of fantastic extra material…like PDFs of all the early GUNSMOKE books, dozens of GUNSMOKE articles & interviews, complete rehearsals of GUNSMOKE episodes, the first TV episode, and a five-hour radio documentary on the making of GUNSMOKE featuring interviews with all the key writers, producers, composers and actors…and much much more. This is a treasure trove of stuff for GUNSMOKE fans…and best of all, it's free!
That website, if you haven’t already discovered this, contains a TON of free OTR programs. One can easily build a nice collection with those files.
You can also go to radio.macinmind.com for a 24-hours online old time radio station. I’ve reconnected with some old faves, like Suspense, and discovered classic shows I’d never heard of, like The Lives of Harry Lime (starring Orson Welles as his famous character from The Third Man) and The Great Gildersleeve.