If one travels, you might notice it. Each one has a blue orb on their signage or somewhere in the shop. The merchants seem to specialize in foreign goods, but often buy local produce and products, to trade in other places. They seem totally unrelated to the others. It seems to be a secret organization, but nobody knows for sure.
Goblins originated the idea of meat on a stick. In larger towns, goblin vendors can be seen hawking their wares, a variety of animals skewered and deep fried. Almost always tasty so long as you dont ask too many questions.