Back when we first started installing the front kit, the only camera available was the HD version from Tesla. It cost us about $345. Of course this was most of the price of the components of the kit. Sometime about July '15 Tesla started using a different camera. The cost/price of the new one is $78. Yep, big difference in the price. And about a year ago a couple of us stumbled on the one on Amazon. Its actually the same part number of the one that Tesla sold for $345. Yes, less than 10% of the price of that first one.
The newer one, used after July '15 is better in low light, but from my experience, it will not work on the front of my '17 S. Its the same as the one on the rear of my car, but when connected to the switch when using a long cable, there's no image. When I connect it with a short cable it works, but that does not help, because I must use a long cable to reach the front of the car. So, I bought a couple of the Amazon $40 camera and tested them. They work fine. I tried another of the newer camera (like the one on the rear of my car), it simply will not work. So, I am back to using the cheaper Amazon version.