Peeper

Oh, these are super rare! This big black square rock will allow you to make a new creature of your own design who will listen to you. It can be intelligent or an animal. These are in high demand and very expensive if you find the right buyer, but getting a permit for it is hard and sneaking it past the baggage checking areas is nerve-wracking! I'm basically selling it for 80% off. Consider the money you'll make if you find a real buyer.