exactly me too. that mask was one of the main reasons why I wanted to watch this film and why I watched this film. but it's barely in this film but oh well. it's actually better that way because any more of it and it would have been overused.
see, this film was made in the golden age of horror movies: 1960s to 1980s. back in the '70s they used to use such cool and scary and disturbing looking masks. the ones they use in this film look a lot like the one used in the last house on dead end street. know what I mean?

I think that mask is my favorite part of the film. So simple looking yet very creepy. It's also the main reason I watched the film. I thought the mask looked cool and wanted to watch the movie because of it.

http://www.halloweenexpress.com/young-female-plastic-transparent-mask-p-7881.html#.
Late, probably - but other people seemed interested.

I still see these masks all the time around Halloween. Not EXACT replicas, but extremely close ones.

I remember seeing those masks in every department store at Halloween back when I was a kid in the '60s, but a Google search didn't turn anything up as far as a present day source, unfortunately.

Let me know if you ever get a hold of one. I would like to have that mask as well.
Horror_Metal