Need4Camaro

Do those exist? I heard they do.
Where can they be found?
Is it street legal?

Injuneer

I've seen them over the years. They sell the entire set of glass for the 4th gens. I'll look it up... probably been 6 or 7 years since I looked into it. I think this is the source, but they don't seem to list specific applications on their website:

Pro Glass-Manufacturers of Preformed LexanŽ Polycarbonate Race Car Windows - Drag Racing Windows

Need4Camaro

Are they street legal? can they still roll up or down on the doors?

Injuneer

I have no idea what is street legal and what isn't. You asked about the rear hatch window. I have never looked at the door window replacements, so I have no idea if they roll up/down. Try the source I linked. They should be able to answer your questions.

Asylist

Street legal? Sure. Street recommended? Absolutely not. Even the high grade lexan can scratch/scuff pretty easily, and you'll end up with a window that's impossible to see through in a pretty short amount of time. As far as rolling up and down, I've yet to see a door window setup that does (see again the scratching/scuffing issue).

They can be made to be removable, but it won't be a quick 2 second thing either. In other words, you'll be hugely disappointed if you're putting these things in a daily driver. I've had them before in weekend only cars that only saw street use going back and forth to the local cruise spots, and even them I found them to highly annoying at best.