It would cost $100 from him. But you lose everything. You have to hold the old game gear for controls. You have to be close to the TV. Close to a wall outlet. It doesn't look nice next to your other consoles. Doesn't play master system games in high quality. No replaced caps. And the list goes on
So yes, for $100 you could get a really bad version. If you want a real version that would be easily playable, you have this