In recent years I have bought mostly from Discogs and Music Direct. I only buy NM or Mint LPs when buying used. The large-volume sellers on Discogs use visual grading, and--even when accurate--that doesn't always indicate how the record sounds.
Like another member mentioned used records stores often have classical LPs in better condition than pop LPs, and I've had mostly good luck buying there if a record and its cover look pristine.

