I use the ones from SA company as well. If you look at there website once or twice, wait a day or two, you should see offers for discounts pop up.
With most balaclava types, they will fog your glasses up, if you have it over your nose. I've yet to try rain-x, or shaving cream, something, on my sunglasses, to counter this.
I emailed SA company, about the fogging issue, they had no plans of making a change. I'd like them better, if they were a little longer. By the time you pull it over your noggin, wrap around your nose, there isn't much left on the back of your neck.