And I'll just put a plug in here for the Florida Sunpass. If you travel to WDW often, it is such a convenience! I bought the Sunpass Mini, which is a sticker I attached to my windshield (so it can only be used with my vehicle). It cost me $4.99 at CVS, then when I activated it online and loaded it with my first payment ($10), I got a $4.99 credit. Using the Sunpass gives you a small discount on the Turnpike toll ($2.00 instead of $2.50) but the biggest bonus to me is not having to wait in line to pay at the toll-booth. We just drive on through the special lane. On FL 429, where you have to exit off to the right to pay at the booth, we just drive on straight, no slowing down or anything. We just love having Sunpass!
There's also a portable Sunpass unit that can be registered to more than one vehicle, but it costs more and I don't think you get a credit back like you do for the Mini.