I have been doing way too much research on transportation this past month or so and have checked out every limo and transportation company you can think of - the cheapest I have found is Happy Limo. We actually used them last May and were very, very happy with the service they provided. I believe the rates were $45 one way from MCO to WDW or $80 RT (I think they include a 20% gratuity which means you do not have to fish around for a tip at the end of your ride), You can find info from Mary on mousesavers.com - she seems to like them or you can check out their website at happylimo.com - Good luck!!