Cinderella,
One thing you have to remember about shuttles, Mears or any other, is that a lot of them are buses that don't have seat belts, and do not support car seats. I remember that being a problem the last time we went, when our kids were exactly the ages of your kids. If you're at least 4 people, a town car at
www.tiffanytowncar.com will most likely be less expensive than a shuttle, believe it or not. It might be your best option.:) :) :D :D