I would run...not walk...run away from this site...the one on the bottom left ( is a $100 mask and I can almost guarantee that it will NOT look like the one pictured... I think you already knew the answer but never hurts to ask!
You know, if you're not concerned about potentially being out around $25 (more if the shipping isn't free, as someone up thread said), you could always go get a gift Visa card and use that to pay for it.
It's still risky, but you wouldn't be giving out any real information and won't run the risk of losing more money. If it's legitimate, you just got yourself a kickass mask for cheap.