What are my options for backseat camera?

[DaveInLA]

I have 2 little kids in child seats and want to be able to see them. The rearview mirror is small, probably in part due to the reliance on cameras. I know there’s the cabin camera, but I don’t believe we have access to that. Is there a way to get that view on-screen while driving? Or a good 3rd party camera that can see the backseat? Preferable something that can integrate with the Tesla screen. I saw one that requires another screen, which I’d like to avoid