tapes
Lot of 50 used blank (i.e. recorded on) cassette tapes on ebay for $40. It almost seems like it would be worth it just to see what's on them, like a treasure hunt; especially since the ones with visible labels have exciting titles like "hammered dulcimer" and "sunrise balloon adventure"
Except these are almost certainly Church tapes. That's the only place tapes would've been used as recently as 2013, they're shipped from Tennessee, and "sunrise" is spelled "son rise", which has to be a Jesus thing. Oh well. Hammered Dulcimer music is pretty, at least. I've heard them played, I'm sure, but I didn't know that's what they're called https://www.youtube.com/watch?v=PMPFaKpF1SM