The Expanse

I saw it listed before, someone brought up the auction house or something like that.  I previously played where they had an Auction NPC right outside of Luna.  You would say "auction" and he would display a list of items that players had turned in for auction.  Auctions would run for 10 days.  By placing a bid, the gold was removed from your bank to ensure that you have the gold to cover your bid if you are the winner.  At the end of the auction, the item was placed in your back pack or bank box or maybe you got a deed for the item.

I saw that there is a player vendor mall in the works, but this may be a good hold over until that is put in place.

The player vendor mall will include an auction system. It's in the works.

Well golf clap for you good sir.