Ok, I'm going to try and help you guys cause I know it's really really pathetic to wait for so long.
As I said before, keep checking online availability.
I can see there are Jet Blacks iPhone 7+ available (All Operators & All Storages).
Keep checking
www.istocknow.com. Trust me you will definitely get it before the shipment leaves.
Also what I have noticed is Apple is bringing the stock to the stores more and more, day by day. So don't miss out on this opportunity. I was very lucky to find one right on first try. If that can happen, I'm sure in few days even you can find one.