It’s not really clear what you mean by pawn shop. If you are looking for used goods, do your search on second hand stores or used stores. There are many charity thrift shops, and other second hand dealers that call themselves thrift shops, but do not support charities.

I thought where people go to sell stuffs to get some cash to gamble was called pawn shop and pawn shop usually sell those goods at reasonably price
isn’t that correct?

@joon1986 I see. Your question said shopping, so that is what confused me. You probably meant bargain hunting. People don’t usually go to Las Vegas to go bargain hunting, or buying stuff in pawn shops, so it sounded odd.

I doubt there’s really anything secret in Las Vegas. Here’s a list I found