Without at least one sensor of two and at least an xbox controller or one remote controller you can‘t do anything with it. The sensor senses the movement of the headset and the controller is needed for the „in-VR“ controls as you obviously cannot see your keyboard. If you use wireless Rift controllers you need two sensors.
Additional info: The Rift requires a spare HDMI connection and a USB 3.1 hub, I believe the sensors require USB 3.1 too.
His offer aims towards people who have the Rift and broke it.
It‘s off-topic but I‘d also really appreciate it if at least the spelling of the title would be checked, it has to do with respect in my parental education.