This is “No Future Companion”; a fully poseable all-metal collectible toy created by KAWS / Hayime Sorayama. It took them three years(!) to design it (together with Medicom) and there’s only 500 made, so yeah, they’re sold out. Let’s hope they make more of ’em!
Update: There’s quite a few eBay auctions going on now, hurry over there if you want to grab one. Watch out for cheap fakes though.