The Swan and Dolphin are the only 'on site' resorts that offer those discounts. The rates are pretty good....DH looked into it, he is a PO...the rates for around XMAS (starting on 12.16.06) were 50% off rack...it is worth looking into....but know that the Swan and Dolphin do NOT participate in Magic Express, you cannot charge to your room from parks, and you cannot use the dining plan.
Hope this helps.