Top Muffin has assembled a persistent listing of iPhone availability at Apple stores throughout the country using a statistical tracking system published by Apple. As of this writing, Top Muffin reveals that only 15 stores in the US are completely without iPhone stock, with the rest alleging stock of either the 8GB, 16GB White, and 16GB Black models. The three Manhattan flagship stores – West 14th, 5th Avenue, and SoHo – all show stock of all three models.

With the exception of states with only one retail location, almost all others show that at least one store has stock of all three iPhone 3Gs. Many of the multi-store states have almost full stock of each model.

While the list is available for at-a-glance convenience, Top Muffin recommends calling ahead, despite stock levels being refreshed in 15 minute intervals on its site.