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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.

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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...

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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 I'm unsure if that was repealed because the majority of search results are about a new law regarding masked law enforcement.

https://www.historylink.org/File/2145

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Buying safety equipment on Amazon is extremely dumb. You won't know that you got a fake until it's too late.
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Very recently Amazon announced they'd stop commingling inventory from 3P sellers and themselves, so it should be safer to buy from Amazon in the future (if you look at the specific seller), but still maybe worth avoiding for safety critical items which are difficult to inspect.
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They still need to prove that isn't just a saying. A good reputation takes a long time to develop and very little time to lose. With safety gear I would not take a chance.

If I'm going to take a chance I'd prefer to support a small company. Amazon is big, but I find most things they sell I can find a small company that sells the same for a similar price and they know their product and so will direct me to what works well.

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As long as they don't make a mistake and send the wrong thing anyway, which happens. You're always better off getting safety critical items from a place that only stocks from a verified supply chain, rather than a place that keep them separate merely by policy.
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