^+1 wasted tons of time on apple site trying to get it to work then, finally decided to go with plan b and in less than 5 minutes I was able to order it on att.
Hurry to att before their site crashes. My brother says he is ordering as I type so right now it still works. Good luck!
Also, did apple nor att offer the in store pick up this year? I have been doing the in store pick up with apple since the first iphone (Love the free coffee and pastries they hand out and got free apple umbrellas last year!)