Actually, I am in Japan. They are not really as common here as some may suspect. Japanese people don't generally collect things the same way that some do in North America, mainly due to space concerns, especially boxed ones.
I have made a history/FAQ of the Bandai Intellivision and I am trying to get it added to the Intellivision FAQ... I have one and it comes with two neat catalogs in Japanese for the games. One is the current games and one is for the upcoming ones.
But, they made commercials in Japan for it starring the Japanese actor Beat Takeshi. There were 17 games released at the start, maybe up to 27 by the end. (still trying to verify the total!)