If I'm not mistaken, I have those aliens right now...
As for the manufacturer; they were somehow linked to the long defunct Harbringer magazine and the company making them disappeared together with the mag. From what I hear, they had quite some backorders that were not fulfilled.
The minis themselves have been OOP ever since. Maybe they got picked up by someone, but if so, I'm not aware of it.
I'm just glad I was able to buy a squad of them, including a leader in hoverchair, here in the LAF Bazaar, because I do not know how I would have acquired any otherwise...