The new oculus quest 2 is basically that. Doesn't need a PC. Do need a phone to some set up though i think.
I have one. The graphics are good and it seems really responsive.
Not played a bunch of games yet but beat sabers is fantastic fun.
I got Moss too as I've seen people praise it but not got around to playing it yet.
Only downside is having the space. you do need something like at least 2m square of free space if you are standing.
You can do a lot of stuff sitting down which only needs you to be far enough from tables or lamps or any other thing you could smack your arms on.
It's about £ 300 if i recall correctly.
you can take a look at games here
Shop VR games, apps, and entertainment available on the Meta Quest headsets. Download hundreds of action, sports, and multiplayer VR games on Meta Quest.
www.oculus.com