Microsoft did not reveal the price of their new controller-free gaming and interface platform Kinect during their E3 conference, but it seems that U.S. video game retailer GameStop has revealed it for them. Kinect is currently available for pre-order on GameStop’s website for $149 stand alone, or $399 bundled together with a 360 Elite console.
As noted on GameStop’s own page, the price is not considered final, and it may change in the future, but this seems like a pretty strong indication of what kind of price point we should expect.