I have a feeling N95 masks are about to be sold out at every Walmart in the country.

If you're shopping for some, they make N95 (P95, etc.) masks that have a one-way flap valve, so it's a lot easier to exhale. It's really worth having that if you're doing anything physical or getting hot. The only real downside is that you can't put them on an infected patient to protect others.

If you're going to the trouble of wearing a mask, you really should be wearing eye protection as well.