Thanks for that, Adam.
I took a look. I checked prices best I could, but there wasn't a lot online to really shop it.
I think I settled on
this one from 3M.
I got the sense that the AO Safety stuff is just rebranded 3M stuff, it uses 3M cartridges. So all things being the same, I thought I should try to find the most comfy one I could find so I'll actually wear it.