$200 is a great deal. I sent Monchos an email for a quote on 4 days and they were kind enough to respond back.

Copy of the email:

Dear Mr. Southern Bound,
Our pricing for 4 days is $279.52. Visit our website www.monchosrental.com We offer the best service on the island. We are also located conveniently at the San Pedro Airstrip.
Sincerely,
Josie


Cheers, SB