Only 2M-3M avail for launch, so it's a mystery if any will have in stock that day but 36M produced before the year ends. So basically 33M-34M available the following eight weeks left in the year.
Limited supply thing is overblown just to cause panic to the impatient launch day buyers to start camping out NOW. Get some people psyched up. This forum doesn't represent the world. I bet after a few weeks, you can walk to any Apple Store or carrier and pick one up.
Patience.