"Xbox Connect" is not a product. You likely mean the Xbox Kinect (motion sensor) or Xbox Cloud Gaming.
Released for Xbox 360 (2010) and Xbox One (2013). Manufacturing ended in 2017.
If you meant connecting an Xbox controller to PC: ~$15–$25 used / $24.99 MSRP (discontinued, scarce new).
Clarify your goal (motion gaming, controller connectivity, or console-free streaming) for a precise price.