Mh. What dates are you trying to go?
You can also go to the website and try to book a split stay and see what happens that way. Try looking for 5 days at one deluxe, and 5 days for another. The other thing too is to watch if you are doing it that way, if you are trying it under any promos. For example, in Oct, Disney has "back to school savings", but if you look at the deluxes, it will say that some of them do not have any rooms at all. If you change this to room only, you may see availability open up. That is paying rack rate, but you can certainly call to see if anything under the codes have opened up or switch your reservations if you need to.
You can also look under places like CheapTickets.com, etc.. the only thing there is, they do not have a very forgiving cancellation policy. So once you're in, from my experience, you are pretty much in.