u/Dana-Mite

I'm creating a scenario where the players will head to Bytopia from Tradegate; obviously they have to go through the Master Trader, and I want the trade quest to be a quick and fun little distraction. I'm having a hard time coming up with ideas that couldn't be solved by just buying something from one of the many places in Tradegate. Obviously as I DM all I have to do is say that the thing isn't for sale, but do you have any suggestions on what and how the players are trading up to?