"You could do that, mister client, but I assure you our prices will be a lot cheaper. Take this goblin for example, something like this is hard to capture, but even harder to keep in check. It was impossible for us to perform the slave collar ritual on it and we're currently starving it to make it weaker. It's highly possible that it doesn't survive the whole process, so it's better for us to simply sell it to you at a discounted price. In here, your mithril will buy you most of our wares, but once we get to the sacred empire I'm afraid you won't even be able to buy more than a couple beast kin."
It means that a beast kin's price is considered to be something around fifty gold coins, I remember back at Ironwoods they sold people for silver coins. I wonder if it's the slave collar what drives the price so high.
"Fine, then I'm just leaving."