Woot offers HTC Vive Focus Plus 6DoF VR Headset Bundle for $199.99 (orig. $629) free shipping.

Product Description:
Experience truly free VR simulations and experiences with the VIVEFocus Plus Enterprise VR Headset from HTC. The VIVE Focus Plus hasinside-out tracking, which means it doesn't need sensors to know whereyou are in the room, and it doesn't require a tether to a PC, so yourapps are self-contained within the headset. Add in 6DoF (Degrees ofFreedom), where you are tracked forward and backward, side-to-side, andvertically, and you can have extremely immersive experiences.