https://www.cnet.com/news/apple-axes-iphone-se-iphone-6s-6s-plus-and-iphone-x-from-its-store/

To make room for three new iPhone models -- the iPhone XS, XS Max and iPhone XR -- Apple will no longer sell the iPhone 6S, 6S Plus, iPhone SE and iPhone X. 

Prices start at $749 for the new iPhones (see the chart below), but those looking for an iPhone bargain can still get the iPhone 7 and 7 Plus and iPhone 8 and 8 Plus from Apple, starting at $449 and $599 respectively.