Steam Machine stock may be in short supply, but hey, at least it hasn’t been taken off sale and scoured from the Internet, never to be seen again. That’s just the fate of Dbrand’s unofficial Steam Machine Companion Cube case, a smartly made (if overpriced and kind of pointless) Portal-themed accessory that it turns out was so unofficial, Dbrand never actually had permission from Valve to sell it. So, now they aren’t, and have issued refunds to anyone who ordered…