The folks on the transportation boards will be able to help you out. If you're driving, it shouldn't be a problem. Otherwise it will be a cab ride. You may be able to book a mears shuttle transportation which should be cheaper than a cab
A chauferred sedan/car service will probably run about $130 or so one way. Taxi will be just slightly less one way, abour $120.
The options for low cost transportation from Sanford just don't exist, even rental cars tend to be more expensive then MCO. Savings gained from lower cost fares from Sanford can easily be eaten up by higher transportation costs.