Mean Gene Hacks has created a motion device that connected with his driving sim gives him real time motion feedback, he does this with a devise that manipulates your nerves making you move is if you were in a real car turning a corner, or in the case of the example in the video, falling off your chair when you crash the car.
The cost to make this motion sim was 50 dollars – he made a video on how here
It turns out a process called galvanic vestibular stimulation—also known as GVS—can be used to alter a human’s sense of balance by electrically stimulating a nerve in the ear using electrodes.