For about 20 years I collected OTR on cassettes. Then one day I bought the complete Fibber McGee and Molly run on CD as MP3 files. My collection doubled in quantity for about $15. Since then all of my new acquisitions have been MP3 files. Some of the digital files are not as good sounding as the tapes, but the quantity more than makes up for it.
What can I do with hundreds of cassettes with OTR on them? I hate the idea of just throwing them away, and that would be a lot of plastic to throw in the ground at the landfill.