Thanks for the info. I haven't checked, but I am assuming that since it is just my mom coming in from Sanford (we are coming into MCO from a different city), it would be cheaper to take a shuttle. All the "shuttles" on the Sanford Airport sight are actually individual drivers/cars. I called or emailed almost all of them. They seem to use the word shuttle very liberally. The usacoach/american coach one does not show Orlando Sanford on their company website, but I will give them a call and see if I can figure something out.
I will also check the price for a rental for one day, but my mom is older and would prefer to just take a shuttle if at all possible.
Thanks again.