There are many towncar services in Orlando. I have used FL Tours and Tiffany Towncar. You should probably go to their websites to get the most current prices....they are probably around $120 r/t, plus tip.
I have used the both mentioned by the previous poster as well and found them both to be great. Depending on where you are going from/to there are also new services like Uber that might save you some $$$.
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