Every time I think of getting something like TrackIR, the price just throws me away. It's half of the price of VR googles for Pete's sake!
But you don't have to have a box strapped to your face and it can be used in a whole multitude of games and sims.
I don't know why the price is so high (£160 or so if you can find one) and I cannot remember what I paid for mine many years ago but it is seriously a great addition for any sim, particularly for people like me who just can't "get on" with VR (yes I have tried that).