-An NPC merchant selling insects and other creepy crawlies-
"You want horseflies? Giant wasp? Gigmucc has them all on his cart, Gigmucc has a discount just for you..."
Captain Aubrey surveyed the deck of the captured sloop. He was amazed that such well run ship could crewed by such a motley gang of men. He turned to the doctor and wondered, "No man is born into piracy. What were these many fellows before they took up the black flag? Surely they can not all share the same story."
What if the innkeeper knew what you wanted before you did?
It is a small, lively town like so many others. Do you wonder who are the movers and shakers here?
Real World: some Indians in the Amazon treat their eyes with a traditional potion applied with palm leaves. Brutally painful, the drug alters vision, giving the jungle's dense green walls greater texture and dimension. You could adapt this to desert or swamps, or other hard to navigate regions.