Price at time of listing - could change soon I suppose. Found this from Amazon Germany via Amazon AU, and seems a reasonable buy for an external usb-c Blu-ray writer with ultra HD. Picture shows this comes with Nero and is USB 3.2 but description says 3.1, so not sure. Does BDXL and Ultra HD discs.
From Amazon:
Slimline Blu-ray writer with 4K Ultra HD Blu-ray playback. USB 3.1 GEN 1 with USB-C connection. 6x maximum write/ 4 x maximum read speeds for BD-R/BD-R DL. Compact and lightweight, ideally suited for use with a notebook or ultrabook. Power provided by the USB port - no need to carry a bulky power adapter.
What software can play 4k discs?