The first wave of Valve's Steam Machine gaming PCs are now on sale. The company just announced the official launch of Steam Machines from a handful of manufacturers, along with the unusual Steam Controller and the Steam Link home streaming box. Right now, Valve is advertising three Steam Machines from Alienware, Zotac, and Cyberpower ; they range from $499 to $1,499. The Steam Controller and Steam Link both sell for $49 apiece.