3M 6800 have all but sold out on Amazon, probably because of this review. I had almost forgotten about Portland in 2020. This author has some great writing about the double standard of non-violence as well. 10/10
Zoro still has them in stock. If you haven't heard of them, they are a subsidiary of Grainger, a huge industrial supply company. They seem to ship even faster than Amazon in my experience.
https://www.zoro.com/3m-full-facepiece-reusable-respirator-w...
Another curious historical point: gas masks were banned in Seattle, back in '99. I'm unsure if that was repealed because the majority of search results are about a new law regarding masked law enforcement.
Buying safety equipment on Amazon is extremely dumb. You won't know that you got a fake until it's too late.
I would generally use McMaster-Carr whenever possible. They will almost never go out of stock even during national crises. I don't generally trust Amazon for items that I can't validate myself due to counterfeiting, e.g. there's a lot of fake knockoff HEPA filters marketed as OEM.
3M 6000 full-face masks: https://www.mcmaster.com/5541T605/
The image shows just a particulate filter, but the listing actually includes 3M bayonet-style cartridges for chemical exposure.