It all depends on when in December you go and where you want to stay.
For example, my girlfriend and I are going to be vacationing at WDW Dec 26 to Jan 1 or Jan 2 and got an AP rate at Animal Kingdom Lodge with a Savanna view for $171.71 a night which is a savings of $285.44 a night based on what waltdisneyworld.com states is the going rack rate for this time period ($457.15 a night).
It probably wouldn't hurt to call reservations and see what they say. I called earlier and was able to find a few things at AKL and a few other places.