Priceline....bid about 20 dollars a day for a intermediate.....you don't know if you will be in the airport or off site.....if you don't like priceline....keep checking the sites....rates change all the time...try mousesavers.com and search Mary' site for Disneyworld and then go to ground transportation...she really keeps up on current discounts...dollar usually has some good ones and they are in the airport....National used to be really good but they have been quite expensive lately and in $$ trouble....Ted