OzB's more favoured disposable mask just got cheaper with the code. Buy up to 4 for even more discount plus cashback incentives.
50pk Disposable 3 Layers Face Mask $4.90, 100pk Disposable 3 Layers $8.29 with Plus membership.
I believe shipping is free for anyone. but note the delivery times of about a week or more based on my area anyway.
EDIT: Thought it might be worth noting that the materials may have changed from the past, despite the item link being the same. The 'Meltblown' description on the item title is no longest listed (compared to when I bought it in Jan), but is still listed in "Materials" under Item Specifics. Will update again when I receive mine to compare it to the original, which honestly I had no issues with. These are still better than the ones they hand me at work, for example.
EDIT2: The masks are in and I am very disappointed to say they were definitely of an inferior quality, and almost a completely different item. As some commenters said before, it feels almost like tissue on some layers. The masks come vacuum sealed and compress into a small pack, which goes to show how much less material is being used now.
The better quality ones I bought in January were manufactured by "Sichuan diweiyi Electronic", but the new ones are from "Tainouer". If you're after a cloth in front of your face to avoid a fine, these will do but nothing more.