Apple's iPhone availability tracker is back and better than ever. The Web app allows you to see which Apple retail stores have stock of the new iPhone 3GS, broken down by capacity and color.
Unlike last year's version which relied on the Apple store’s JSON data feeds, which were only updated daily, tracker 2.0 is linked with Apple’s sales system, which is updated hourly, 24/7.
A quick check reveals that there's a lot of inventory available right now in New Jersey:
Whereas California is lot more constrained: