This is probably the cheapest way to have an FPV goggle experience, but it does require an Android phone. The EasyCap Viewer app supports side-by-side display mode which allows you to use any VR headset to view your flight. I listed Google cardboard, but you might want to consider a better quality headset for comfort and quality. It'll also let less light in, fit better and offer an overall better experience than Google cardboard, but for less than $4 you can test the experience and consider whether or not to upgrade.