$1
Eleazar can break down the pricing better for rock.
All classical, be it 1 album, or a complete boxed set of LVB's 9 symphonies, ( I have like 5 versions of all 9), are a whopping $1.
Caveat Emptor rules the day, though Cracky the vinyl dealer does provide a few operational TTs with headphones, so you can check it before you buy it.
Washed - nah.
Jazz from $1 to $20, with a deep grove The Sidewinder on the wall for $100, I lust after it, but will never buy it.