Sylvester Archipelago

-Potatoes, Captain. - Tiberius replied, confused.

- And that's what everyone else sees, - he said, shoving his hand deeper into the bag. Some of the potatoes spilled onto the floor, and Maarin pulled a Medlia fruit out of the bag. - Unfortunately, you're not the first to come up with the idea of breaking the law and selling Medlia where it's prohibited. I've been doing this for fifteen years. But transporting vials of the substance ready for use is not only impractical but also fraught with unpleasant consequences. I think you understand me.
The captain put the Medlia fruit back, gathered the potatoes, and tied up the bag. Then he led Tiberius out of the cargo hold and returned to his cabin to finish his rum.

Added 4 minutes later
I had this thing enabled from the very beginning: they sell corpses to the Halekhids and buy Medlia, which they then sell to the Hysteos. That's how it is.