The Xperia XZ1 was launched a few weeks ago and is already ready for shipping, with it laying claim to being the first device to launch with Oreo. Its price tag of $700 is a fair one for the most part but there's a chance Sony may have done more with this one.
https://www.notebookcheck.net/The-Xperia-XZ1-is-the-first-device-to-hit-shops-with-Oreo-onboard.249570.0.html