I bought an Oculus Go last year for € 30. Its support has been dropped for quite some time, and you can only activate developer mode and sideloading through an old version of the Meta Horizons app [1]. But if you do that, there are 71 GiBs of games to explore on the Internet Archive [2]. Some need patching to remove an online check to a server that no longer exists, but that is easy enough to do with a (regrettably Windows) tool someone published.

The Go is not the best headset of course, but the games are a different style because of the 3DoF tracking without camera's. Somewhat slower paced and sitting down. A style I personally like more.

You can also unlock the device to get root on it [3], which is quite neat, although there doesn't seem to be any homebrew scene at all. Not even the most bare-bones launcher that doesn't require a Meta login.

[1] That doesn't even seem intentional, but it does mean that once the old version of the app can't communicate with Meta servers anymore, any uninitialized Go turns into a brick.

[2] https://archive.org/details/gear-vr-oculus-go

[3] https://developers.meta.com/horizon/blog/unlocking-oculus-go...