We too set up for transfers with Carnival less hassle and sure of price and RIDE. Took one in Ft laud. (taxi) told it would be sheeper and cost us about 70.00 with tip and ride. We like the sure thing to get to ans from an airport now since things have changed so much with 9/11. Ta set it up and no worries. Staying at Marriott and they take you right to the pick up that morning. With a group you may also find a shuttle van that may be the same cost of $30x6 , remember it is 30 for round trip with the transfers and if a van is 90.00 eachway may be nice to have you all in one van. Have a great time. Going earlier on the Glory.
We booked a shuttle from Orlando to Port Canaveral for $110 round trip for 6 people. It was the best deal I have found. I was leary at first as I am used to taking the cruise transfers, but this place proved to be not only reliable, but friendly and polite on top of it.
The name of the shuttle service was Omni trans. Their website is their name.net and
you'll find their number on their site. Feel free to email me if you have any questions.