Actually if you get off the Turnpike at US27 (EXIT# 289) the exit ramp toll is $1.25. But that is not the recommended place to get off unless your hotel is somewhere down the US27 corridor.
Staying on the Turnpike beyond US27, the mainline toll plaza is $2.50 as mentioned. If you're heading directly to Disney World you can bypass the congestion of I-4 by taking the new Western Beltway (TOLL 429). Simply leave the Turnpike at EXIT# 267A (Direction: Tampa). Using this route there is no additional toll on the Turnpike but there will be a $1.00 toll on the 429. Leave the 429 at EXIT# 8 "Disney World/Hartzog Road" and follow the signs into WDW.
If you remain on the Turnpike and use I-4 (EXIT# 259) then you'll pay an additonal $.50 at the exit.
There are no tolls on your route in Tennessee or Georgia.
BobK/Orlando