Nothing short of a small fortune. But I would reconsider getting a small monkey. I hear once they hit their teen years, they become very aggressive and out of control. That is why there are so many shelters for monkeys and such animals. Cute and can train when little, but after awhile, can become a big nightmare. Also, some areas it is illegal to own exotic pets. You should check into this as well. Should you decide to adopt one, think of all the concequences first