Looking for a VR headset for a kid

Not sure what you mean by games already on it. All the headsets I know of require additional hardware like ps4 or a phone inserted inside. A phone vr is your cheapest route, but the quality won't be the best. If you want quality the ps4 will probably be the easiest route, but it starts at 400 . The price will probably drop and the quality will probably get better when the 2nd generations roll around. I am holding out for the 2nd generations.