Sold out until this Friday when this is all supposed to be over, unless it's a very weak filter that won't do anything for smoke. Show me where you can get genuine N95 masks (as a non-essential worker) as well please. There are tons of counterfeit masks going around.
It’s not my job to help you find N95 masks, they’re available from most hardware stores and definitely from Amazon. I just looked and there’s at least one type available on Amazon that’s not 3M in addition to full respirator masks and everything in between, and it’s easy to find other stores through Google that sell 3M disposable masks if that happens to be the only one you trust.
In addition to that, loose particle filters as spare parts are not uncommon and you can literally strap any filter on a fan, close your windows and start forcing indoor air through it to improve the ambient air quality.
If you have a furnace, you have a filter. Take the filter out of it and stick it on your box fan. Even if it's a little dirty, it's better than nothing.