https://www.techradar.com/news/htc-vive-pro-starter-kit-offers-every-vr-thing-you-need-other-than-the-pc

The HTC Vive Pro raises the game for virtual reality in terms of screen resolution and fidelity, but it also raises the price. If you're looking to get involved with Vive VR for the first time, a new HTC Vive Pro Starter Bundle pack could be just what you're after.

Though originally billed as an upgrade unit for existing Vive owners, the demand for the new high resolution Vive Pro unit has necessitated the need for a whole new bundle for the Pro, including all the controllers and motion trackers you'd need to get up and running.