And if you're already thinking "I'm not sure that would fit under my welding helmet,"
You can see why I was thinking her recommendation seemed a bit.. umh... "crowded under the hood":
So Matthew got on-line and did some searching, and we called a few local welding supply places. We asked their recommendations for welding aluminum and stainless steel, and found a solution with what we felt would "get us by" until the can find another resolution to our problem. We ordered a box of 10, but it does look there are a few places on-line that you can purchase them individually. They cost about $7-$9 each, depending where you find them.
At first they seemed a bit awkward. You have to left the straps over your head and pretty much leave it one once your "suited up" (there's no easy on/off release clasps) but the first time you take it off and smell the contaminated air, you'll realize how good it works! I'm impressed. And if you're worried about your glasses and helmet fogging up, the adjustable nose-clip pretty much took care of that, and the handy front respirator (anti-caking) worked great to keep the fog away too. I was quite impressed with this low-cost helper and it has a waaaay better performance than disposables I've used in the past.