I was just watching a cool Japanese carpentry video (https://www.youtube.com/watch?v=XoHXEprhgM4) and he uses a "groove cutter" (9 minute mark ish) which looks like a circular saw housing that uses a shaper esque cutter instead of a blade.

Googling around doesn't bring about a bunch of results. Is this something that is sold to the US?

Looks pretty useful.