Monkey Business Party 19045 W Capitol Dr, Brookfield, WI53045 Monkey Business Party sells party supplies. Customers will find balloons, greeting cards, costumes, toys, wrapping paper…More and more. The retailer's store is also fitted with a private party room. Three party packages are available to choose from and all include the set-up of the room, clean-up and basic party supplies. It is located in Sendik's Town Center.