This is probably the only option besides the cardboard for where I live; the slight bend of the g4 makes it a little hard to fit most headsets. I've heard good things about this one and you can find reviews on YouTube. You also may be able to find it cheaper than through Amazon.

http://www.amazon.com/gp/aw/d/B0116IKAHC/ref=mp_s_a_1_1?qid=1457428527&sr=8-1&pi=SX200_QL40&keywords=noon+vr&dpPl=1&dpID=41pjcX1WRHL&ref=plSrch