I wish I could give a recommendation for what to purchase. Unfortunately, respirators of any kind are nearly impossible to find. Although I have far more time on my hands this year, my refinishing projects have been placed on hold completely because I can't do them safely.
As an aside, respirators intended to protect the wearer from construction debris and solvent vapours do not prevent the spread of Covid-19, as exhalation air is not filtered. That unfortunately hasn't prevented people from panic purchasing. That means that people who need them for their (essential) work in construction and manufacturing can no longer obtain them, and this is part of why supply chains have been impacted. If you use a construction respirator or a disposable half-mask with an exhalation valve, understand that wearing it will not prevent the spread of the virus. When in public indoors, you should instead wear a cloth mask, non-surgical paper mask, or other disposable mask that does not have an exhalation valve. The intent for wearing a mask to prevent viral spread is not so that it filters the air you breathe in, but so that any virus-laden moisture that you exhale is trapped in your own mask. The more people that wear masks, the less transmission that will occur. This is not a political statement; it is a fact.
During this time of supply shortages, I would suggest that we refrain from leisure projects requiring any purchase of new respiratory PPE so that the limited professional-grade equipment can go to production workers in the construction and manufacturing industries whose work has been deemed essential. Currently, they are being forced to work without PPE around crystalline silica, asbestos, and solvent fumes without response from authorities who would normally assist workers in refusing unsafe conditions. Those workers are facing a difficult choice between their lives and their livelihoods, and recognizing that, we can decide not to compound the problem further.