floppydisk.com bought Athana a few years ago, and got the remainder of their stock. AFAIK Athana was one of the very last manufacturers of several media formats. I don't know if floppydisk.com ended up with any of their manufacturing capability, or if Athana even had any at the time of sale. Athana had stopped manufacturing at least some of their offerings (e.g. 5.25" hard sector) over a decade ago.

floppydisk.com didn't get them all though, we bought around 28,000 5.25" DSDD diskettes surplus:

https://i.imgur.com/f5jM4mO.jpg

The above pictured lot is where the diskettes for the boxed releases of Nox Archaist and Burger Becky's game came from.