We used SAS Transportation, and it looks like it was back in 2016, so no clue if they're still running. It was like a 15 passenger van (that was full after all the stops), they only picked up at certain hotels, but I feel like it was $30/person round trip or something. It definitely was worth the savings for us.
I think the taxes at MIA are higher than FLL, which is one reason it's usually cheaper to fly into FLL.