It is becoming a growing trend to see online retailers announce, or put up for sale, items not even announced by the manufacturer. Product leaks happen like that all the time. But in most cases, those ads, or product placements, usually get pulled in some capacity or another. That hasn't happened with the 250GB internal hard drive for the new slimmer Xbox 360. Despite not having a formal announcement from Microsoft, you can indeed go buy yourself a new hard drive if you really wanted to, right now.