Still looks like there are about three SN sources that I can confirm are working, for now. I'm also testing out a local supplier near me and if it goes smoothly, I'll post an update. I've heard whispers about telegram sellers, but I've got no experience there (with SN, anyway).
Potassium nitrite (KN) might be a solid alternative, it's been way easier to source lately than SN, at least from what I've seen. That said, I haven't seen a full thread from anyone who's actually used it yet, so it's still a bit of a grey area protocol wise even though the pph said it should "work as effectively as its sodium counterpart". So, I'd say that's another path to be explored. I've considered it myself. I think it'll only be slight adjustments needed.
As for the usual suspects — BO/BM seem to be locking things down, and DMC's status is unreliable at best and compromised either way.
It's a shit balance, honestly. Talk about it too much and the suppliers start vanishing because governments catch wind. Don't talk about it at all and people are left in the dark, panicking, suffering. Either way, someone loses. Total double edged sword.