Hi Maria, thanks for visiting us at the Disney Parks Moms Panel.
I am glad to hEAR you are considering a Disney vacation in December. You will see beautiful holiday decoration at the Parks, special parades and shows. An unforgettable experience!
There are usually
special offers for early December, but they come out as packages, including stay at a
Disney Resort Hotel, Disney Dining Plans and theme park tickets. You can always check at Disney
official website for finding the vacation package deal for you. Remember Special Offers change often, so keep checking!
If you are looking for theme parks tickets only, I encourage you to buy it already because usually there is no special discounts. After buying your tickets, you are allowed to make your FastPass+ selections up to 60 days in advance if you are staying at a Disney Resort Hotel, or up to 30 days if you are staying off-site. It can be a great deal for saving time during your vacation, especially if you are planning to go during Holidays when parks tend to be more crowded.
Hope this information helps your planning. Let us know if you have further questions.
Have a wonderful day!
Gina V.