My first post here so please go easy.
I went to their website to activate a SIM I had ordered a few days ago and accidentally stumbled upon this. No idea about the quality but seems like a good deal, given the requirement of masks in Melbourne from this Thursday.
I was able to order 10x 5PK for $9 total. Shipping is $8.90.
3-Ply multi layer
EDIT: For those saying it's not a deal or not worth the risk, please bear in mind that I'm in no way affiliated with ETel. I saw something that might be of use to someone so I posted it. I'm not sure if they will follow through or cancel the order but worth the try if you're still looking for masks. If they don't honor, oh well, too bad!