I paid a dollar for about as mint as it gets of Beethoven's nine symphonies, Karajan/ Berlin on a tulip bordered Deutsche Grammophon box set, most sides not even a pop on them.
$40.00 for an unopened box set of the 58-65 Solti / Vienna Wagner Ring. I have only seen two sets, one nice condition, the other acceptable, and any other set, trashed. I almost wet my pants when I saw it, an unopened box as I wasn't even shopping for music.