The cost for shuttles from the airport to Disney World and Universal Studio-area hotels vary, depending on where you're going and how many are in your group.
Mears is often the best price for small groups, but the other 100+ area vendors offer very competitive rates.
You can compare prices on more than 30 area shuttle companies at Orlandohotelshuttles.com and book the best deal there (including Mears, FYI).
Hopefully this will help you save a few bucks!