We have seen plenty of cool but expensive VR simulators in the past few years. If you know your Arduino and electronics, you can always try to build your own. matthewh8 has shared a guided that shows you what it takes to convert a hammock into a VR flying machine.
The app used for this project is running the WRLD SKD in Unity. The hammock has an ESP8266 using Arduino code. You can use a cheap VR headset for this project.