https://www.amazon.co.uk/Verbatim-87410-MF2HD-Inch-MBDiskett...
IBM say Sony were last to manufacture them, and production ended in March 2011: https://www.ibm.com/ibm/history/ibm100/us/en/icons/floppy/tr...
Although this article says Sony only had a 70% market share when they stopped production: https://www.cnet.com/deals/sandisks-extreme-pro-2tb-ssd-is-b...
https://www.independent.co.uk/tech/from-floppy-disks-to-beta...
I’ve seen a TDK pack from Japan with a date code of 2018.
You could get Floppies form Maplin in store in the UK until they went under 5 years ago.
There is still plenty of “fresh” stock out there that seems to be under a decade old, and I’m sure they are still produced in small batches for critical systems and well the Japanese government.