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Well, you don't have to order any pizza's to start cutting! Heck, you don't even have to cut this stuff yourself! Go to www.googlecardboard.com where they sell pre-cuts for cheaper prices than ordering a pizza! Sure, you wont get any food for it, but you'll get some of the best crafted cardboard for your google experience.
I found the instructions and was going to make them, but it looked like a bit more of a craft project than I wanted to commit too. Luckily, if you are lazy, you can order a precut kit from DODOcase...which I just did. It costs about $25 with shipping.
If you are feeling crafty, here are the instructions: https://gweb-cardboard.appspot.com/downloads/cardboard_design_v1.0.zip
If you have $25 burning a hole in your pocket: