I take Uber from Palm Beach to Miami (intercounty if not interstate), a distance of 75 miles. Super convenient if taking an international flight with luggage. It's about $100.
In the recent past, this distance would cost $200 minimum with a taxi or a black car service. There is also a train (TriRail) at about $10 per person, but it makes multiple stops and you still need a car on the Palm Beach end.