Has anyone seen, found, retrofit a power sunshade for the rear window like those found in luxury cars?
This would be quite an undertaking. I have it in my Mercedes CLS. It's completely built into the rear hatch, and is completely hidden when down. Not sure where the device would hide as the Prius is a hatch back?
This isn't automatic by any stretch but we use these on the rear passenger doors which I have a set on top of the tinted windows. Good to keep the flies/mosquito out as well as letting you open the windows, letting air in and out and not hear any buffetting noise even at highway speeds. WindowSOX / Window SOX - Sunprotection for babies,infants and pets