Inexpensive Virtual Reality and Immersive Viewers

Virtual Reality on the Less Expensive Side

These Products Are Shown in Roughly Increasing Cost

Cardboard Viewers
Shown at Google I/O 2015
Works with a Smartphone. Various models. 
There a numerous types and design. A typical one is I AM CARDBOARD, such as v. 2 and EVA. Priced beginning at $14.99.

Source and ordering information: https://www.google.com/get/cardboard/get-cardboard/

Immerse Virtual Reality Headset, $47.29

Works with a Smartphone. Adjustable head strap and foam facial contact area.

Source: http://www.firebox.com/product/7017/Immerse-Virtual-Reality-Headset

VR One

Can use iPhone 6 or Samsung Galaxy smartphones and some others. Zeiss VR One bundle at $129.00 which includes the headset with strap and the smartphone tray.

Source: http://vrone.us/zeiss-vr-one

Samsung Gear VR

Has the following sensors: accelerator, gyrometer, geomagnetic, proximity. Micro USB connection to Galaxy note 4 or S6. $199.99 in some online stores. Details on features at http://www.samsung.com/global/microsite/gearvr/gearvr_features.html

Source: http://www.samsung.com/global/microsite/gearvr/