There are lots of them and more being made.
One of the guy's over on the RPF forum sells copies of the ones he makes at Cons in Japan.
Hobby Link Japan and Starship Modelers usually has a decent amount of kits and some of the more mainstream stores sell some of the kit's as well.
I'm not into Ma.K but doe enjoy the details and paint jobs that have been done on them,
You might be interested in the Maschinen Krueger site.