Adorama has Rsa KN95 protective face masks in stock

They are not medical, perhaps for shop use for dust? Everyone seems to be making masks, but few of those are NIOSH approved.

Not all N95 masks are created equal. The majority target the construction and industrial industries to protect you from particulates, such as those you can get at places like Home Depot in the US. I have a bunch for my shop. These are not rated for medical use. However, they might be better than a cloth mask which my wife is churning out for others.

Read more at 3M's "Surgical N85 vs. Standard N95 - Which to Consider?"

I also have a pair of Respro pollution masks for biking that cuts down on pollution/pollen when I'm riding. Got them after participating in a university study of cyclist pollution exposure while commuting. I carried a 15 pound pack of instruments 24x7 for a week to measure exposure while cycling, driving, sleeping, etc.

I pulled a bunch of masks out of my work shop. I had bought them years ago to use while woodworking, painting, and dust protection while tilling my fields with my tractor. I use the simple blue paper ones while shopping, the big complex 3M respirator still sits in its bag, it looks more like a gas mask. I have a box of cheapie paper cup dust masks that I judged to be the least useful of the bunch, I did not feel that they would protect anyone, so they just sit. They do help with dust.

After visiting London and riding subways for a week, I thought that N95 masks would be a good thing. I coughed up black dust every night while there.

Ah yes, forgot about the paint respirator with replaceable cartridges hiding out in the garage. Not sure I want to go out in public wearing that.