I googled it and come up w/ this number 800-972-6242
If you google it you come up a/ a lot of different options.
When it gets closer don't forget Norad's web sight. That sealed the deal for my then DS 6. He still says that Rudolph is real b/c we saw him on the computer.
A bit OT but in college there used to be a number we could call and leave messages for Santa and the next day you call the recording and there are personalized messages. You have to listen to all of them to hear yours but it was really fun, even them for me.