I've had reasonably good experience on ebay. The shops that are honest and know how to rate LP quality are somewhat easy to spot. I had one or 2 buys that didn't meet the quality level rated, but the price in that case was about right so I didn't feel bad.
I had one case where I bought an LP from a guy selling his personal collection. He said it was "excellent condition" and I paid $22 for it. I received a really dirty, and somewhat worn LP. I immediately sent him an email telling him how disapointed I was. He offered to take it back for a full refund, or let me keep it and he'd give me a $20 refund. The LP was worth $2, and the guy was straight up honest.
I had one case where I bought an LP from a guy selling his personal collection. He said it was "excellent condition" and I paid $22 for it. I received a really dirty, and somewhat worn LP. I immediately sent him an email telling him how disapointed I was. He offered to take it back for a full refund, or let me keep it and he'd give me a $20 refund. The LP was worth $2, and the guy was straight up honest.