I regularly troll pawn shops and thrift stores, you never know what you'll find there. For example, they usually have a bin full of vinyl. The staff pulls out any that are valuable, but what is valuable on the market has no relation to what I consider valuable. Jackie Gleason, for example, made many records that aren't available on CD. His stuff is great if you enjoy easy listening, old style.
A couple months back, the pawn shop had acquired what looked like an old DJ's 12 inch single collection from the 70s and 80s. $.50 per disk. I grabbed them all.
I’ve found that archive.org also has a large number of out of print vinyl.
What the market finds valuable is partially a signaling problem, as it is only loosely connected to any individual’s taste, and more connected to quick sales for record companies. The market as a whole can’t discover prices for products that individuals aren’t aware of and seeking out in the small window of first-sale. It’s not too different from the traditional VC investment strategy, now that I consider it.
A couple months back, the pawn shop had acquired what looked like an old DJ's 12 inch single collection from the 70s and 80s. $.50 per disk. I grabbed them all.