Hello,
I was just in WalMart (I hate that store!) because they sell a small wireless backup camera, similar to this one:
Older version, I think?
The one in the store had a much smaller bezel around the screen and it had four buttons. The camera is virtually the same as this:
The clarity of the screen is okay -- I could pick out my son standing 50' or so away from the camera. I don't know how it would work at night. The cost was ~$98.
I think it uses Bluetooth between the camera and the screen, and you need 12v connections for both. I don't know if you could use two in the same vehicle, without interference between them.
I could easily see how one could cut off the lecense plate bracket, and mount the cameras on the stub of the mirror (where it pivots) on my xA. And I was thinking of getting a small plastic/rubber ball and cutting it to form a small shroud around the camera after it had been positioned to give a proper view.
Who's going to do it first?
[Edit: Of course, the Aptera (Cd 0.11) has no side mirrors -- no mirrors at all, actually.]