I ordered an extra cable on launch day, it originally said it wouldn't deliver til mid October. This morning I woke up and there was a shipping notification for delivery on the 26th. So it may be worth it to order online or maybe start checking Apple Stores around that same day
I ordered my cables online early this week, just got a notification that my cables were shipping today from China. Adapters aren't available yet for me but it says October when I check my order status
I walked into my AT&T store in Newnan at 10am , waited about 30 min and got a White 16GB.
They had 7-8 cases for iphone 5 including Speck Candyshell in 4 colors and CandyShell Grip (which I bought) in 3 colors. They also had Otterbox and Incipio cases