https://www.thatdailydeal.com/fasttrack/fast_track.php?id=55786&chksrc=txt&sscid=41k4_6f7n7

Plus, for those who make their own cotton masks, a tip for making them more effective is to use sterile cotton balls, pulling them apart and using them as an additional inner layer of protection.
Note: These are not N95 Masks, but they are their supposed equivalent, as the KN95 certification is the Chinese equivalent.
Some hospitals are using them because of the shortage of N95 masks.  BUT YOU buying these does NOT add to any shortage of masks for medical professionals.  So, they ARE ethical to buy.
Here is the most serious comparison of the European, Chinese, American and other equivalents:

Comparison of FFP2, KN95, and N95 Filtering Facepiece Respirator Classes

Re-usable?  Possibly, if done correctly. Here is a series of articles on sterilization/re-use:

https://utrf.tennessee.edu/information-faqs-performance-protection-sterilization-of-face-mask-materials/

https://ctmirror.org/2020/03/31/yale-researchers-find-a-way-to-sterilize-and-recycle-thousands-of-respirator-masks/

http://www.taipeitimes.com/News/taiwan/archives/2020/02/15/2003731027

https://www.n95sterilization.org/

Rev. Dave’s Disclaimer: I am not a medical professional.  The data on all of this is rapidly changing as, collectively, we learn more. BUT, it is my “amateur” opinion that, if you wish to have among the best masks ethically available at this moment to us (KN95 vs N95), then this listed above is a decent deal.  However, proceed at your own “risk.”

— Posted by Dave Perkins