I was told that I will receive an email when supplies are known to the store and to call the number in the e-mail to make an appointment to pick up the phone. As of 4:39 pm 9/17/2014 CST no e-mail. Limited quantities so be sure to call the instant you get the e-mail. I pre-ordered on the 12th at an Omaha, NE location.
Apple told me that the Kansas City location was getting a huge inventory and could guarantee a phone on launch day. That's a two hour drive I might make if Target doesn't come through.