If you take the South exit from the airport (SR 417) and get off at Exit 6 (State Rd. 536) - there will be two $1.50 tolls. If you get off at Exit 3 (Osceola Parkway) - there will be an additional toll that I think is 50 cents. That used to be an unmanned toll both, and I got caught there twice with no change!
If you take the North exit from the airport (528 to I-4) - the tolls will be slightly less. I don't know what they will be, because I don't like going that way.