With the current system both buyer and seller have to make clear they either want to sell or buy something very specifically, and even at roughly the same time. A topic on the “trade” forum, which is already present, would be much more efficient.
I once sent some Sicydium from the Netherlands to London, in the bagage section of an airplane. I packed eight or so of them in a bag with a liter of water and filled the bag with oxygen. I put the bag in a small styrofoam box, which was packed in the guy’s suitcase. They all survived and are now swimming happily in a London fishtank!
This should be possible with paro’s too, I guess…