It would be a good idea to identify the factory, country and brand name for which they are being made.
Go to Etsy.com and specify shop location USA. There are a whole bunch of home seamstresses making and selling masks. It’s a good way to support an American trying to make some extra $.
When you specify USA location, also check out the info on the shop before you buy, because there are some sellers on Etsy that are really companies, not people working from home. Who knows where their products come from. You can tell the home businesses from the others by clicking on the shop name and reading about it.