Just left Miami Port on Monday, cab to Miami Airport is $24.00 per cab, no matter how many people. Some of the cabs are mini vans so I would imagine that you could fit 5 or 6 people.
RCCL Explorer of the Seas 2007 Bermuda
NCL Dawn 2008 Bermuda
RCCL Majesty of the Seas 2009 Bahamas