5.0" DIY Google Cardboard Mobile Phone Virtual Reality 3D Glasses.
Saw this on OZBargain awhile ago, now the price is dropped back to USD$2.99 incl shipping.
Similar to the Google Cardboard PB tech is selling for $25.96
These 5.0'' DIY Google virtual reality glasses, made of cardboard and resin lens, are specially designed for Google Nexus 4 / 5, Motorola Moto X, Samsung Galaxy S4 / S5, Samsung Galaxy Nexus, Xiaomi 3 and other smartphones with 5.0 inches screen. With Cardboard App, it's easy to install and operate.