Most of the Apple stores across the country are now keeping decent stock according to the reports I've been reading online...just go to your local Apple store early in the day, i think that would be your best option.
I think so most of the stores go with the Pre-order criteria and according to it they do stock with few plus/minus. If you find out of stock label then don’t be surprised because the demand is huge and it may be possible to happen. I to some extent agree with SeanHRCC. Yes, you go early in the day maybe you get but if others have the same thinking, it will be quite hard for you.