The type of VR locomotion I would be most used to (though I have never tried) is probably a VR treadmill. One walks in place on the treadmill to simulate movement and prevent VR sickness. However, the cheapest of these still go for about $1000 (and look pretty silly). I think that thought needs to be put into where and when VR is used in gaming, so that it enhances the gameplay. In a VR game that can truly deliver experiences that one can never get in real life, then using a treadmill to simulate movement might provide extra realism.