Dell Home offers the Tobii Eye Tracker 4C Gaming Peripheral for Windows, model no. 12004648, for $149.99. Coupon code "EYE40" drops that to $109.99. With free shipping, that's the lowest total price we could find by $39. This device provides simultaneous head and eye tracking to provide a complementary input to keyboards, mice, and gamepads when playing PC games, thus providing a more immersive experience by actions such as controlling the camera angle in FPS games. Click here for a list of current compatible games and here for a user video. Deal ends January 19.