Google Cardboard Plastic
google.com
google.com
Any more from Google <your country here>?
(incl. schematics on GitHub)
They did have a point, much like the "BEYOND VIRTUAL REALITY. ACTUAL REALITY." slogan in this.
By the way, I have a Nexus 5 and never bought a Google Cardboard, is it worth it just for the joke of using it?