Sorry, but I had to do it:
Ultracade is apparently selling stools too:

I imagine they're really cheap since you can make these ones in the bathroom.
Joseph Elwell.
P.S. I guess I should point out that I don't have any problem with the spirit of what Ultracade is trying to do. I think that, although I dislike the MAME license, that someone should enforce it. And I can't imagine that MAME devs have the time nor the resources to do it. So it makes sense that someone with a commercial interest in enforcing the license would help MAME out. And the only companies I can think of with a commercial interest is those that compete with MAME. Basically, you pick a bad license, you deal with bad people.