Help identify "blockart" game
It looks like the product is actually called "BLOCK ART", and I believe it's made by Japanese company "Nichigan" (based on this).

I can't find a web page for Nichigan. Maybe someone that can read Japanese might have better luck? Its logo.

It appears to be vintage, and it's probably no longer produced. Your best bet of finding one is probably through the vintage toy crowds. It's not going to be easy or cheap. 

Alternatives:


MARBLE ART, by the same company
Hunt down this Chinese knockoff(?)
A more advanced wooden version
Build your own from Lego pieces
Hire someone with a 3d printer to make one