Thank you guys for feedback.
The vice is 700$ and the Oculus is 500$, i'm just speechless. Moreover i don't think 3DNes will be able to profit any of their advanced features.
Google Cardboard is probably a good approach as i imagine 3DNes VR is just SBS rendering with head motion tracking to rotate the camera a little bit. Users will still use traditional controllers to play the game. Trinus is an interesting solution for 3DNes :)
Just check it out, Trinus costs ~ 8 or 9$. Not a very comfortable experience for the mass :)