Although Apple admitted that jet black iPhone 7 units are easier to scratch, and customers should use protective cases, these handsets are already out of stock. Even more, the silver, gold, rose gold, and black iPhone 7 handsets are only available in limited quantities for Apple retail stores' walk-in customers.
http://www.notebookcheck.net/Apple-s-iPhone-7-Plus-and-all-jet-black-models-already-sold-out.174478.0.html