they haven't charged me yet either . but i also bought the screen protector on a different order ( afterthought) and they didn't charge me for it and its already been shipped and according to tracking almost here
I'm sure that's because they are not shipping until the 17th .
I happen to go to the website logged into my MS account and it let me order just one ..
I just got my email yesterday with the link to order one ( from the mailing list )