It’s $59 on the mothership or you can get the same one with the add-on rear camera for the same price.
https://www.amazon.com/70mai-Camera-Built-IMX335-Android/dp/B08TBNFG66
I bought one of these from the mothership and mounted it as a rear facing camera in a older Model S. The camera did not like the USB power ports in the vehicle, switching to the power plug adapter that came with the camera resolved the power problem.