Taxi I can't speak to - I think I've seen people post $60 or so.
I've only done round trip town cars and that has ranged from $110-140, not including tip. But that's both ways. One way would probably be a bit more than 1/2 of those numbers.
We used Tiffany Towncar last Oct. Great service, fantastic driver. Much better than waiting for Magic Express....much quicker too. We paid $104.00 (had a $5.00 off coupon), plus tip, for round trip from airport to POFQ. Had a grocery stop at Publix, and our driver even helped us load and unload our grocery purchases.
Will not hesitate to book them again for this Sept.