i dont remember what brand but i have a cheap headset which uses your phone as a display (its like google cardboard, but better quality/made of matte black plastic and the distance from the lenses to your phone is adjustable along with the focal length)
its not the best quality, either its focused and you see the pixels, or its a bit blurry and you cannot.
but considering all i use it for is the occasional goon session or to fall asleep in minecraft via steamlink and a vr mod, its "good enough"