It's already out of stock?
It isn't available to order until tomorrow (March 14th).
So you haven't missed it, it is just listed and showing out of stock because they are getting ready for Collector Con tomorrow.
And can I also say how happy I am to see the window packaging back? I liked the art of the plastic free packaging (not as much as the original art from earlier but hey), but I much prefer seeing the product in the box so I can tell if there are any issues rather than hoping nothing is wrong when opening them.