Depending on when you will be there, you can rent a minivan one way from National for $20 a day. Pick it up in Orlando, and return it outside of Florida. It's a great deal if you don't mind the drive.

They want to get the vehicles north at that time of year, so they practically pay you to take them.

https://www.nationalcar.com/index.do?action=hotDeals.do&type=uszl-withnav-header