VR is still not a huge thing. But it is getting there. Of course there are the Samsung Gear things. But those are a large expense and quite frankly nothing VR is that great that you should go buy something expensive to try out a novelty.
Google cardboard is basically that. A piece of cardboard you fold over and attach a rubber band and you have a VR viewer. It isn’t comfortable or feature rich, but the word cardboard is in the name so what did you expect.
Folding is easy, and apps are decently easy to use, but it is still a novelty.