I hadn't thought to look on Etsy, just because I thought when I had looked there previously (just generally, unrelated to anything happening now), they weren't very friendly about shipping to Canada. But that was many years ago, so I should probably take another look. Thank you for the suggestion!
I did actually look into Etsy last night, and as
@Kor mentioned above, there were actually a large number of sellers located right here in Canada! And a number of them were even offering free shipping, which was great! I ended up ordering two masks, one from around here, and one from B.C.. I thought it might be best to have a spare just in case. As mentioned, a lot of the cuter designs were already sold out, but I was able to get one with nice floral design, and the other is a little less colourful, but with a pattern. I ended up going with two different sellers just because I wasn't sure how any given one would fit, so I didn't want to put all my eggs in the same basket.
I also saw some really nice space-themed ones, which I adored (I love space imagery!), but, in addition to being a little more pricey, those ones wouldn't be ready to ship for another 2 to 3 weeks. Since I'd like to have one sooner rather than later, I went with sellers who said they could ship in a day or two. I may still go back and order a space-themed one or two, but I haven't decided. On one hand, money is definitely an issue, but on the other, if they start calling us back into the office soon, it might be good to have a few different ones I can rotate through. (That's assuming they even let us wear them in the office.)
So now it's just a matter of waiting till they arrive. Thank you again to
@Spot's Meow for the great suggestion; I would never have even thought of that!