This deal has ended.
Amazon.com has the XBox360 250GB Console + Kinect for $399.99 with free shipping. This is the best price we could find by $10, but what makes it a really good deal is the $50 Amazon credit that comes with it. Kinect is well-reviewed and very popular as it lets you control the game with your own movement. Sales tax is only charged in KS, KY, ND, NY, and WA.