New iPhones will no longer have the Lightning-to-jack adapter included in the box
So, it's an outdated connector, but we'll still sell it for $9.
Now, since the new iPhones were announced yesterday some were knocked off the roster — that's the way the cookie crumbles. Right now, the Apple Store has the iPhone 7, iPhone 8, iPhone XR, and iPhone XS. The iPhone 6s — the last model to have the 3.5 mm headphone jack — is dead and gone.
Driving the point home even further, Apple has decided to stop including the Lightning-to-jack dongle with its new iPhones. And no, not just the new models that were just announced — any new iPhone you go to buy from the Apple Store. This includes the iPhone 7 and iPhone 8.
But still, if you insist on using this archaic connector with a pair of dusty old wired headphones (you can probably find them in a museum) — you can still buy a dongle for $9 from the Apple Store. Those haven't been discontinued.