[Baltan II]

Or maybe you'll encounter one of the gray ones and pick it up. They're all over eBay too, although obviously at varying degrees of being overpriced. BBTS and Amazon have all three different sets available and might have them all in gray, but that's something of a gamble. Or, because they're still shipping and available, you could pick one up from a friend or acquaintance who's found the gray version.

I don't entirely understand Bandai America's reasoning behind the running change, but on the other hand I actually want to own both varieties of colors eventually, having an even bigger cityscape with some colorful variety.