Yes, it is quite thoroughly defunct. Back issues show up at high prices at specialty bookshops occasionally. I offered what I had in the basement a few years back at a discount and what was left at the end of the summer went into the recycling bin, so a lot is truly rare. I’m not sure I even have a complete set myself.
In the backlog of my things to do is a best-of compilation of articles from the published (and one planned but unpublished) issues.