For like the past five years, I swear these have been the most commonly available blank cassettes, so I get the feeling they're still being made. The last time I saw these actually in shops here was probably 2010, which makes sense, but I suspect Maxell has kept making them to meet some kind of market that just... never stopped using them, and all the sellers on amazon and ebay are just buying job lots of leftovers.

I don't know why I am so invested in answering these questions. Sorry for clogging up your comments!