Too late or too early for Alamo next January??

[soccer mom]

We don't rent cars very often and never in Orlando before, but we decided to spend a few days in the World before our cruise next January and I started seeing what it would cost to rent a car to drive to Miami. I went to Alamo's website and it indicates that there are no cars available on January 21, 2007 at the WDW Car Car Center. Can they really be totally booked that far out, or are they just not booking for 2007 yet? Should I try by phone, would it make a difference? National has them available, but the Port of Miami (I think that is where we need to go) does not have a National drop off location there. What do you think?