There are several to choose from and I think mears is the most popular one and depending on how many adults and kids but I think a family of 5 would be $127.00 round trip
I looked into shuttles, I think Mears was $18 per adult and $14 per kid (4-11). You can also rent a car one way for about $40. Hertz is on property and budget has a place across the street with a free shuttle. I have a one way rental booked with Budget (much cheaper than Hertz) to get to Port Canaveral for cruise. I think a Taxi may be cheapest about $33 one way and it looks like they have mini vans to fit all 5. I think that is what we are going to do and maybe negotiate a quick stop for water/soda/snacks. Hope that helps.
That is what I had planned to do, because we need it to go to the port on Friday, but after reading the boards and $45 parking fees decided to just rent it for a day instead. Good Luck!