I generally use National car rental on every trip down, and I find current codes on Mousesavers or in my local entertainment guide. this summer, however, I could not really find an acceptable rate so i turned to priceline on the advice of my brother. I did get what I consider to be a good deal. I received a car from
Avis, which is on site at MCO, and i took a full size/4 door car and my bid was accepted for $14 per day, plus tax and fees. This is for late August into early September. Not sure what to bid for a van though, so do some research and then bid under the lowest rate you can find by a couple of dollars a day. The only drawback is that once you make an offer and it is accepted, your credit card is charged immediately and there is no cancellation. good luck getting a good rate, no matter where you turn!