I've noticed they stopped selling them in shops here (UK). I was told in the vape
shop I go to they've stopped manufacturing but maybe take that with a pinch of salt. They're pretty reliable but just because they're not stocking them anymore doesn't necessarily mean that.
Certainly if they've stopped manufacturing them they're still selling their backlogs as they're definitely available online.
I use the sub mini (i think that's what it is anyway) much less these days but always found it a good
tank when I was doing DTL more - apart from the leakage through airholes which seemed to be a common problem with many
tanks of that era.