Sony PSVR

While there are persistent rumors of an Xbox VR HMD, Sony is currently the only video game console with a VR HMD.

It is easier to install and set up than a PC-based VR system, and while the library of titles is much smaller, the quality of the titles is higher overall on average. It is also the most affordable of the positional tracking VR options. But, it is also the only one that cannot be developed on by the average hobbyist developer:

https://www.gamestop.com/collection/playstation-vr

Cost: $400, plus Sony Playstation 4 console