On the marriott.com homepage, under 'Explore and Plan' in the drop down menu, click 'Deals'. On the page that follows, enter Orlando and all the deals available will be shown. Check through them for any Marriott/Disney or Marriott/Universal deal tie-ins.
The Orlando Disney property is BIG. It is a bus ride to get from any hotel to any park entrance. Don't be suprised by that. The Marriotts in Disney Village, where I usually stay, are about a 15 minute bus ride from the "Park" entrance. Again, don't be suprised by the distance. There are boat workarounds and tram & train workarounds but it is still a distance. Go for it. Take full Nalgene's for everybody. Enjoy.