This is the email I received from Nike customer service a few days ago:
Our Nike Super Bowl Collection gear is an excellent choice for any fan! I definitely understand your concerns about availability.
This style was available, but has now been completely sold out. I'm not able to locate any availability through any of our Nike store locations. The style number for this hoodie is 640549-010. We don't know ahead of time whether we will restock a particular style. We are always receiving new shipments, so you can continue to check Nike.com periodically. We do update our inventory daily. You can also follow us @NikeStore on Twitter for all of our latest release and restock information.
It is very possible that some other third-party retailers may have them available, but I do not have access to their inventory. You can use our store locator online to find stores in your area that carry Nike and then call around to see if they have them in stock.