I havent found it on a menu yet... there is a thread buried somewhere about it you should read.
What I gathered from that thread is: You have to call the Grand Floridian Bakery to special order it in advance. More than likely, the front desk CM will have no clue what you are talking about (happened to me) and you have to insist on the bakery. I left a message there and havent heard back yet, plan on trying again tomorrow since its been awhile. They have to be served in the Grand Floridian, but can be at any of their places, even tea. It is only on the catering menu for weddings, and only made there, so its not on other menus.
Thats what info I recall from that thread... Good luck to you!