cratedigger

noun1

1. •
   (slang) A person who habitually looks through crates of vinyl records at music shops, especially in pursuit of interesting or rare records.

   • Serious vinyl collectors will have a minor epiphany at Car City Classics[…], where notorious crate-diggers like the UK's Kirk Degiorgio (a.k.a. As One) have been known to close the store. — 1998