I think it will be difficult to order such artists, but it is best to turn to special agencies that will help you find and offer good options. I celebrated my bachelor party in Riga and we turned to Riga stag do, excellent organization and enjoyment of the holiday are guaranteed.
A lot, I am guessing you would have to pay for flight, most likely first class. Hotel, 5 star, and maybe like $15000 per hour he is there. This is just a rough estimate, get in contact with his agent.