I went on Autoslash.com to try and get a good rental car rates for our trip in August, since the prices were very high. I got 8/9 to 8/16, picking up at Orlando airport and dropping off at the Dolphin, full size, Alamo for $207. They also had minivans and SUV's for mid-250's. Check out the site. I did prepay but you can cancel up to 48 hours and get a full refund. If you cancel within the 48 hours, it's around $40.