Google Cardboard VR Headset
Shortly, virtual reality will be making its way to the mainstream in a big way, but the cost of a VR headset is still significant enough to deter most for now. Enter Google Cardboard, by far the most affordable way to dabble in VR. This simple, no-frills enclosure uses none other than your existing Android 4.2+ smartphone, an app, plus some miscellaneous parts – like pizza box cardboard, a pair of lenses, a rubber band, and some velcro – to create an immersive virtual experience on the cheap. Just hit up Google to download the plans and get to work.
Learn more at Google Developers – $Free (or almost)