Finger Monkey
Estimated Value: $4,000
Other Pet Expenses: cage ($4,000), food ($100 per month), diapers ($20 per month), healthcare
Finger monkeys are the smallest primate known to man. These tiny monkeys never grow to more than about 6 inches in length. The price of one of these creatures depends on a variety of factors but in general, you will pay between $1,500 and $4,000. On average, these monkeys have a lifespan of 12 to 18 years.