Down I-95 to I-4, no tolls.
Down I-75 you will need to take exit 328 to get on the Florida Turnpike for about 45 miles to its exit 259 which connects to I-4 exit 77 west, tolls total about $2.50.
(copied from another post)
Airport to Disney, you can do it for 75 cents, exact change not needed.
North airport exit, left at first light, bear left, 1-1/2 miles to next light where you take two lefts to get on Bee Line (528) west. Pay the 75 cent toll. Next get on I-4 west (southwest). Takes you right to the Disney exits. (Grocery store at the Rte 535 exit which is just before the Disney exits), right at end of this ramp and next right.
Disney hints:
http://members.aol.com/ajaynejr/disney.htm
Returning to airport, watch first green signs carefully and take I-4 East. Then on to 528 Bee Line. Get off Bee Line at exit 9 Tradeport, left at end of ramp, cross under, get into middle lane (low price gas station here) middle lane must turn right onto McCoy, 1-1/2 miles to airport entrance (Semoran)