There has been alot of discussion on the disboards about Dollar Car rental.
Go to their website put in Orlando and your dates. no codes needed. Hit the Go button and when it comes up with pricing results there is an option to click on "city specials" for Orlando. I believe its mid to full size and the rates are very cheap right now.
I have looked several times a day for many weeks. I finally booked with a code from the transportation boards here thru Alamo. We will be there for 11 nights 5/22 to 6/2. My total rate for a full size car was $215 (including all taxes).
I have done the Priceline route as well but so far Dollar and Alamo have had much better rates.