If you don't have a sewing machine, or even elastic hair ties, here are some websites selling non-surgical cotton face masks:
Reformation is selling packs of 5 for $25. You can also order some to donate.
Monogram: 2 for $20. "Your purchase includes 2 masks that we'll ship to you plus we'll donate 2 masks to workers at essential businesses in LA. "
Sanctuary: $28 for assorted 5 pack.
Ball and Buck: 1 for $20. "For every mask you purchase, we will donate a mask to a hospital in need."
Alabama Chanin: 1 for $12.
American Blanket Company: 5 for $29.
Maison Modulare: $36-$60 each.
Hertling: "Minimum 50 masks @ $10/each, 1-for-1 model. We’ll ship you what you buy and we’ll donate the same quantity locally to a NY hospital"