For what its worth, I've seen KN95 masks and N95 masks being in stock from trustworthy retailers at reasonable prices (~$1 per mask) so I picked some up. My lay

For what its worth, I've seen KN95 masks and N95 masks being in stock from trustworthy retailers at reasonable prices (~$1 per mask) so I picked some up. My layman's assessment was that they did a significantly better job of sealing around the sides of the mask than the cloth masks I'd purchased early on or the surgical-type masks I'd more recently switched to. They also had the side benefit of not allowing air to escape out the top and fog up my glasses.