google cardboard

Google cardboard knockoff, $8 with free shipping.

Except that the minimum order is 2, so you have to get two of them.

http://www.dxsoul.com/product/neje-zb02-diy-google-cardboard-resin-lens-virtual-3d-glasses-w-nfc-for-4-7-cellphones-brown-901335470#.U_-EELxdXPY