Just called a at&t store I'll be going to friday. They said all at&t stores will be getting around 100 3G iphones each, and cases and everything else you might need will also be in stock and ready to go. Of course the bigger stores will get a bit more, and the smaller stores a bit less, but she seemed to think 100 was about the average. And (as we already know) all at&t stores (that are selling the iPhone) will be open at 8am. I have a feeling the majority of people camping out will go to an apple store, so I think anyone should be able to walk right into a at&t store no problem. I remember during the first launch, my local at&t store had maybe 3 people in line.