There is the Shuttleliner that chrges $29 each way and picks up and drops off at the Sleep In Hotel at Rt 30 and Florida Turpike. Haven't used it, but hubby will in a couple of weeks. Don't know anything more about it except the phone number 352-237-9900.
www.shuttleliner.com
Also if you look in the daily sun classified section, there are people who advertise in the back section that they make airport runs. Not sure how much they are.
Judy