There was an old user, nozomu, who I'm aware had N. They've left the site though. I was quite saddened by it, their diary thread was one of the few I kept up with, but apparently they left to focus on recovery, so I suppose it's for the best and I wish them well despite missing them.
Anyway, some others might have it? Best I can think of is people acquiring it in Latin America, since it's still actively traded in some countries in that area (can't recall which off the top of my head, sry) for some veterinarian useage (guessing as a tranquiliser or something, considering what kind of drug it is). There were guides on how to get it and writeups of people who acquired it detailing how complicated it was, usually they'd have to go to multiple shops due to the shopkeeps catching onto why these random tourists were showing up and buying their N.
Damn Nitschke. Promoting some controlled drug that literally no one uses anymore as the be-all end-all. At least SN used to be relatively easy to acquire rather than being a prescription-only medication in its heyday, before being replaced entirely by other drugs (N and other barbiturates have been entirely replaced by benzodiazepines at this point).