nostr:npub19fcv2nflra09c6p9xz8c8detwj6uy07u4z4m25qh836mnvxtatdq6aay3c not sure how inexpensive the masks are on Amazon but this is the company I buy from (in bulk).

https://bonafidemasks.com/powecom-kn95/black-and-white-ear-loop/