GameStop has NDC bundle twice as the best selling console.. 1 is NDC but out of stock on their online store (it is in stock in retail stores, I checked their page on that), then the other shows as a pre order released on the 4th of December, which I assume means that's only when the online store will replenish its stock of the bundle.
These guys want people to go to the actual stores so I wouldn't be surprised if there is artificial limits on online availability. Either that or online shopping ratio exceeded expectations and stores didn't have enough stock compared to retail