A few new face mask links (affiliate links below):
- Karoter 50Pcs Disposable Face Mask for $3.86 with free one-day Prime shipping; these are shipped and sold by Amazon, should stack with shop-with-points deals too
- 50 PCS Disposable 3-Ply Safety Face Mask for $3.69, this is slower third-party shipping
You can also buy face masks on eBay for around $5.