The Kamenbito Children's Survival Guide: A Lesson in Behaviour and the Frightful Demons known as Humans
Shea did this for a project back in late 2005. It had to follow some guidelines of some kind, and having construction paper elements was one of them. Required reading in ALL Kamenbito primary schools.
Tyson Tabbert of Facing Costumes can make replica shyguy masks for a bit over $100. They look great and won't break easily, but don't expect any kind of email replies from this guy once you've paid him.