Gemm -- being a bit of a flea-market -- is a mixed bag. Yes, there are some very good sellers there, but there are also some absolute criminals...well, alright, technically, they're not criminals, because they're not forcing you to buy their wares, but the prices strike me as...well, a bit much.
My point: know what you're doing when you go in there.
And yes: vinyl is a good alternative, if you don't have access to a time machine, or infinite resources.