My guess is they severely underestimated their stock needs, and rather than having orders pile up for something they don't know when they are going to get from Asus, they are playing the out of sight out of mind approach.
I got mine at their B&M store, they only had 1 in stock (and no one knew anything about it until I gave them the PLU#, so you may want to ask them to check that straight away). They didn't have any keyboard dock in stock though.