N95's are available for order online in small quantities, but the prices are high ($10-$20 each). I wouldn't buy them unless you have someone sick or in fragile health.
For just basic use like grocery shopping, surgical masks are available online and provide decent protection.
Maybe more important than masks, tho -- especially for grocery shopping -- are
gloves. They provide WAY more protection than wiping a grocery card with a disinfectant wipe.
There are three types of exam gloves -- vinyl, latex, and nitrile. Vinyl gloves are super-cheap, latex are moderately priced, and nitrile gloves are the best and most expensive.
Here's a factual discussion of the differences. [NOTE: I have not purchased from this company, but the article itself is helpful.]
https://myglovedepot.com/blogs/news/nitrile-vs-latex-vs-vinyl-gloves-whats-right-for-you
And...worst case scenario,
ANY kind of glove (kitchen, yard, bike, winter) gives you some protection that you didn't have before. Anything that provides
any barrier is better than nothing.