We tried several, but we were looking to buy local. I found this by digging around:
https://www.kcppe.com/ We bought ours from Susan Ferguson and they work just fine.
https://www.etsy.com/shop/BeautifullyWoven
I look at it this way. If I get 25% to whatever % protection from what other people are spewing in the air, groovy, that's better than 0%. If I can protect others whatever % (and it's close to 100%) from what bugs I'm spewing in the air, I'll do it. It's not that big of a deal. I know masks are hot, not very comfortable, etc., but this stuff has gotten out of control. I'll put my personal comfort aside for the greater good.