Most experts agree that the best place to purchase a baby monkey is from a reputable primate or exotic pet breeder, where the monkeys are born right on the premises. These breeders commonly have websites with photos and information on the animals that are currently available.
It's highly recommended to make sure that a private owner is legally allowed to keep a primate as a pet where the prospective owner lives before moving forward with any plans to purchase one. Many places have strict regulations on primates, and if they are allowed, a permit may be required. One of the best ways to get this information on local animal ordinances is by contacting a local office for the Department of Natural Resources.