The story is about a man who stumbles upon some alien tech - I recall a lighter that just produces a flame without any mechanical parts....
He doesn't have the wealth to trade the art for these items so he basically becomes a middle-man.
I recall a quote about him asking himself "How do they manage to get the coffee to taste as good as it smells?" or something along those lines.
All of the trade is also set in those dusty non-specific trinket shops you occasionally walk past and wonder what on earth they do and how comes they haven't been turned into a Costa yet.