While Facebook's virtual reality effort involved a multi-billion dollar purchase of Oculus VR, Google's gone with a decidedly simpler route: cardboard. Following the end of its Google I/O keynote, Google's put out an app called Cardboard that lets users slot their Android device into a do-it-yourself cardboard viewer. When looked through using special lenses, you can interact with various Google services like a VR headset. It's not as polished as Oculus but does give you a cool VR experience.
We can't wait for FlappyBird VR and AngryBirds VR. Stoked!
Oculus VR Development Kit 2: $350 US
Google Cardboard: Free App + Cardboard cost and accessories $3 - $8 US