[Pre-Owned] Xbox 360 Kinect Sensor, No AC-Adapter $4 @ EB Games
Kinect sensor for Xbox 360 without AC Adapter (preowned) $4 at Eb Games.
I bought 2, one to use as a 3D scanner and another one to use as depth sensor for a robot, so I am not using them for its intended purpose.
They also have sensors with power adaptor included for $15.
*NOTE: This Kinect sensor is only compatible with the new Slim format XBOX 360 consoles.