I have mp3s of "The Shadow", Bob Hope with the Armed Forces Radio Network, some Jack Benny, Mercury Theatre (think War of the Worlds), and a few others.
Sirius/xm satellite radio has a channel dedicated to old time radio called Radio Classics. I listen to it 8+ hours a day at work. 30 + years of stuff I never knew about. Some of ithe is bad (Lum & Abner, Baby Snokes) but most of it is good. Phil Harris and Alice Fay Is my favorite. Some others that stand out is "The Earth Abides" staring John Dehner. It's a must listen.