Beeline Ground Transportation (
www.gobeeline.com) offers a scheduled service to and from the Orlando airport to Port Canaveral for $25 one-way/$43 rnd trip. (It leaves from the airport at 11AM and 3PM and the scheduled return from Pt. Canaveral is at 10 & 1). They also offer non-scheduled private service but I am not sure of the cost.
Nancy