Not sure if anyone would be interested, but the Internet Archive has a huge collection of old time radio shows from the 1930s and 40s especially. These include dramas, mysteries, horror, comedy, etc. Unfortunately, the website isn’t super voiceover friendly, but it’s possible to use. Anyway, thought I’d toss this out there. https://archive.org/details/radioprograms
Personally, I subscribe to rusc (rusc.com) so I can access OTR easily on Sonos, and I don’t have to bother with the unusable mess that is the Internet Archive.