I never found one in Florida. key word being Florida. I was used to all rental agencies offering these great daily rates if you rented during a certain time of week. These special rates were not existent where I was in Florida.
I'm from the Midwest and when I got to Florida and found out what they charge for rental cars....I bought a toad!
The closer you are to Orlando the more the rental fees where. I was staying in Leesburg and was shocked what they wanted to rent a car and no specials.
Perhaps the further away from the mouse house it might be cheaper. I'd make a few phone calls before you head out.