I am going to say it, and I may get flamed for it, but I find disposable face masks much more pleasant to wear than reusable cotton ones. If you're the same, then you can get a box of 50 LANSWE Disposable Face Masks from New Egg for just $14.99 shipped.
Disposable Face Masks
The Disposable Face Masks are designed for single use and are to be disposed of responsibly once finished with.
They are 3-ply and designed to block droplets, prevent haze, and anti-fine particles. With elastic straps that go over the ear, they won't fall off easily, which is what you want. You shouldn't have to adjust or fiddle once on.
Reviews are decent for these and at this price, you can't go wrong. They will sell out at this price, so you may want to order them sooner, rather than later.
Shipping is free, making these a really good buy!