I suppose if you were stuck and really NEEDED one ASAP, going and getting in line in the wee hours would be the best chance. Unfortunately, doing that is not an option for many (or maybe most) due to store locations and work obligations.
This particular location that is close to be is right by the highway and exceptionally popular. I would imagine that played part in their being one of the two stores in state being stocked.
Some years ago, I think it was the Xbox release, this store had people camping out front for over a week. It was on the news. The local police had to station officers there and people were having to be told to take down tents, on the sidewalk out front, during business hours. There were RV's on the parking lot with people taking turns placeholding in line. It was insane.
As mentioned above...and I don't know exactly when this news was released, but I would about bet a bill that there is already a large group of people camping out in the hopes of getting one.
I rather wonder if they will pull the trick Turtles (records) used to pull in reference to concert tickets. Regardless of how long you waited, they did a lottery style selection based on getting a raffle ticket. Oh man were we super duper mad the first time they pulled that....