Is it allowed to buy by the bulk of masks and hand sanitizers in your area? Government today are now limiting what you could buy because anyone will hoard and to avoid it, they are now allowing bulk buying.
Online shops need capital so starting an eshop will cost unlike having just a facebook page and sell things on facebook, will cost just the time. Marketing locally will work as long as you can deliver by yourself.
It's actually a gray area. While the gov has anti-profiteering laws in effect, they are hardly carried out on establishments, let alone online stores. There were even cases people stole hand sanitizers from hospitals and the perpetrators were never caught.
So you could still see a box of China/ generic face masks sold between 15 to 30 bucks.