You can buy the masks above using any of our links, and suitable N95 masks that you buy from a hardware store are also safe. You should make sure, though, you are buying the kind without valves: Those won't protect others as well if you have COVID-19, according to the CDC. You can also buy masks from the Project N95 website, which are vetted by healthcare professionals. If you are buying from Amazon, it's better to make sure that the seller is the company that makes the mask, not a third party, and you can also check the reviews to see if anyone thinks the product is counterfeit. For KF94 masks, websites that sell Korean health and beauty products are usually good sources. You can also look up the company that makes the mask online and see if you can order it directly from them.