Not really a thrift store, but once, about...shit, must have been 15 years ago already, but I was at Half Priced Books, and I found the original US release of Porcupine Tree's The Sky Moves Sideways. Hadn't heard the band at that point, but I had read an article on the band in Guitar Player about a year earlier, so they were on my radar. Still the best album they've done as far as I'm concerned.
I once found a copy of Frank Zappa Live At The Fillmore East on vinyl at a library sale for like 3 bucks.
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