I bought KN95 masks from Bonafide masks. The price was reasonable, and I was confident that I was buying directly from an known retailer and not getting knock-offs. The cost goes down as you buy more, and they are averaging around $.55 per mask if you get 30.
I think these masks are the best option for the money. The ones I got have been decent and worked well. I've read reports of independent tests and these have performed well, and they were well priced, so I got them. Even if there was no pandemic ever again, going forward, I will keep using them for other tasks like sanding woodwork and other work that puts out a lot of dust or particles. I used to do work and only wore a mask or respirator for pretty dirty work. Now I realize, why was I cheaping out? If I'm doing dirty and dusty work, I'll use the mask. I don't mean cutting some 2x4's outside. I still would not wear a mask for that. But for other jobs with more dust and junk in the air, I'll break out a mask.
https://bonafidemasks.com/Powecom-kn-95/