The record store owner was telling you the truth, there is virtually no market for classical lp recordings. Notice he didn't even offer you ten cents per record? No market at all for opera lp's. Not easy to even give them away, but you can try.
Classical LP & CD Collection - How do You Sell When Record Stores Don't Want?
I have 250+ classical LPs many in M- condition for the vinyl and 300+ classical CDs that I want to start selling off. I recently brought a box of them to a record store and the owner just said "I can't sell this stuff!". Do you have any suggestions? I was thinking of offering in specific groupings all the Argo, Deutsche Grammophon, RCA etc. etc. I'm not trying to make top dollar on anything just the collection has gotten large and something has to go.