Well, if you realllllly want to save $ you can take a public bus. It will cost you $1.50 per person and it takes you within a couple blocks of the resort. It is supposed to take an hour. I think it's called the International Drive route but it has a number, too. You can get info about routes and stops by going to the Orlando Airport (MCO) website and click on transportation.
We are going to try it out on the way to our hotel because our first hotel (before we switch to RPR) is just one block away from the bus stop. I'm sure others will chime in with slightly quicker and higher $ options.
Karen