No, that requires a PC. There isn't much in the all-in-one space other than the Quest.

Some sort of Android box that can bolt onto Vive or Index would be great

Not standalone. Last I recall, they _do_ have one, but it's much more expensive than Quest, and didn't have very good reviews.

It needs a PC in addition to spending another $500 - 600 for the headset.

More like 900 USD if you want to use it the way it was meant to be used with the peripherals.

What do you mean? The HTC Vive, non-pro version only costs $599 with base stations. Where are you getting $900 from?

I agree with the high total cost though. Most people pushing PC VR, will forget about how much a real VR ready PC will cost. It's easy to spend close to $3000 even when people loathed to admit it.

If you add the controllers, how much more does it cost?

Controllers were always part of that $599 package (at launch, 4 years ago). The only other peripheral most owners consider almost a "must have" would be the Deluxe Audio Strap which goes for another $99.

My Vive cost me £400 for the whole thing, for reference.