I have an M-Disc writer and some M-Disc DVDs, so I took note of this submission ~2 years ago:
PSA: Verbatim no longer sells real M Discs, now puts regular BD-Rs in M Disc packaging - https://old.reddit.com/r/DataHoarder/comments/yu4j1u/psa_ver... / https://news.ycombinator.com/item?id=33593967