You can look on Travelocity's website. It's one of a few that I know of. Once you go there, go to cruises, then Disney, then Wonder or Magic for ship, then go to type of cruise (3 day, etc.), then click on your date. It will show all the rooms available. Be careful if you put in that there are 4 people in your group because there are some rooms for only 3 people. There were quite a few rooms available on this website for your date. It changes quite a bit as people upgrade, cancel or buy a cruise.
Hope this helps!
Ann