To be honest I'm not sure. I got mine from
Toy East but when I enquired a week later about getting more they had sold out. They are limited production. The Marusen car is a run of only 1000 models.
It might be worth searching the net. The company that makes them is called Pit-Road and they are a collaboration with Ebbro. Pit-Road have also made a handful of other cool models including a 1/24 scale model kit of the Marusen Technica Sunny. This is another collaboration thing and is basically the old Doyusha kit with a few extras and some decals.