We got them at the Studios, but we can't remember the exact location. It was listed in the brochure you pick up at the park in the section with the character greeting spots. I hope you find them.
Thanks for the good wishes. You will love going in December. Photopass is absolutely awesome! I'm glad you'll be joining my PTR. Just come over when I post a link to it. I still have to come up with a name for it, first.
Enjoy your time with the girls.