While not onsite, Marriott has some of their "timeshare" properties about as close to disney as possible without being onsite (i.e. just across the street.) I mention these as Discover America has some MVCI (Marriott timeshare) properties as one of their Daily Giveaway Promos on June 1st (Tuesday).

The http://www.flyertalk.com/forum/marri...0-10am-et.html thread in the Marriott forum discusses this offer. But in a nutshell, you could get 5 nights in a 2 bedroom suite (and MVCI properties are very nice and big) for only $600.

In Marriott's Worldcenter Resort complex there are three MVCI properties. One of them, Imperial Palms, is a three-bedroom property and couldn't be used by this promo. But the other two "Palm" properties, Royal and Sabal, are 2 bedroom units and could be used. And being on the Worldcenter Resort property you would get full access to the Resort's amenities including the very nice pools.