Dell Home offers the Tobii Eye Tracker 4C Gaming Peripheral for Windows for $109.99 with free shipping. That's tied with our mention from last May and the lowest price we could find by $29. It tracks head and eye movement to add a complementary input to PC games, providing a more immersive experience by enabling actions like controlling the camera angle in FPS games. Click here for a list of current compatible games and here for a user video.