Local Lotte Markets have what appears to be legit KF94 masks which are the Korean N95 equivalent. I know there are some fake Chinese knockoffs of the Korean KF94 but hopefully a reputable company like Lotte isn't selling them.
It was my understanding Korea was banning exports of these outside Korea so I'm not sure how legit these are. If anyone has more information please share.
They were priced at $6 per mask locally which is expensive but perhaps worth it if they are legit KF94.
More info from 3M on comparing these Korea 1st Class/KF94 and other masks: