[haydenlee]

Check out the Samsung Gear VR and Google Daydream if you have a compatible smartphone. If you don't you can use Google Cardboard (I believe even with iOS).

From a development standpoint the main difference between mobile headsets and PC headsets is that mobile VR doesn't track the physical position of your head or hands. However you can still learn a ton and make a lot of cool things with them.

[omg_ketchup]

You can just download VR prototyping kits for Unity or Unreal, you don't even need a headset.