I also saw it in "Pieces of Eight" or whatever that store is that has a lot of Nightmare stuff, which is inside the park. Like DrFink said, I'd check World of Disney, or maybe even wander around downtown at night to see if the carts bring them out. Good luck!
You can call Disneyland park's shopping number and give them the information people gave above. They will be able to find the item and ship it to you. I unfortunately do not have that number with me today. If you call one of the other Disney phone numbers they will be able to give you that number. I have used them several times for things that I have wanted. Good luck and have a Magical Day.