What's the best way to get the new iPhone 6s?

What's the best way to get the new iPhone 6s? - 1

Added (1). ok

Added (2). I want to get the new iPhone 6s plus when that comes out later on this September. (I'm going to wait in line for it. And I don't know the best way to buy it. I also want to get it through AT&T. Should I pay for the phone at the full price(Like around $849) so that I can get a new one every year, or should I get the AT&T next thing. But I'm only 18 and I don't have any credit, so I don't know how the AT&T Next thing will work with me. But anyways, please give me the options I have thanks!

Added (3). And also I want to get the middle gigabyte version. (Probably 64gb) Thanks!

If you can afford, you can get the phone without contract or unlocked. Also, pre-order will start so instead of standing in line, you can pre-order too.

Could pre-order one once available. It would guarantee fastest availability