The 3M Aura N95s are pretty comfortable and cost a couple dollars each at Home Depot. They're also pretty good about directing your breath away from the top so your glasses won't fog up when wearing them.
The only downside is the straps: they both go behind your head, one high and one low. They take a bit to get used to, but you can't put them on with a hat on. But the plus is that they are very comfortable for the long term. Sometimes, with glasses, I have to take the glasses off to get the mask off.
The ones with the blue straps, the straps seem to deteriorate quickly if left in the sun, but I've only had a couple where the straps broke.
You can get them small quantity on ebay, and ebay seems to police the sellers, for around $2 each. You can also buy them direct from 3M for $1 in quantity 440, or at least you were able to 6 months ago when we last looked.
I've been buying them from ISP: https://www.industrialsafetyproducts.com/3m-9210-aura-n95-pa...
(As a bonus, they have the 9210, which has better straps, retail you generally only see the 9205, which is ok too, but the straps are just rubber bands and they don't fit as securely.