I have managed to get 2 already.
Go online after 10 pm.
Order
Select in store pick up
That's what I did and after a week of trying scored mine today. One of the Apple employees told me to select the iPhone model and the store just before 10 pm and then keep refreshing it (sort of like eBay bidding).
Of course, this strategy only pays off if there's an Apple store near you. But it worked for me (finally).