The above points are good, but even new LPs are a gamble. For instance, I recently purchased the new Linda Thompson LP and it's a bad pressing. A huge mark on one side (which is audible) and random noises throughout. You never know what you're going to get new or used, but with used LPs the rummage sale prices often make them well worth the gamble (if they look relatively scratch free, that is).
How to Judge an LP
OK - so I'm new to vinyl, and I envision myself stopping at the church rummage sale, scrounging around for good LP's. How to I judge the quality of an LP just by looking at it? What matters and what is superficial? What should I avoid at all costs? Should an LP with a missing sleeve be automatically disqualified. I might have used to know this back in 1980, but the memories don't last! Thanks all you vinyl heads!