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It depends on your needs. If all you need is a backup camera and screen mirroring, you might want to consider an MMI box (such as andreams MMI), which, on top of screen mirroring, will allow you to seemlessly install any aftermarket backup camera. On ali, they're going for 240$. A decent camera will set you in for 20$.
If your car didn't come with navigation from factory, and you're keen on full android experience and adding navigation, among other things, you might want to buy an aftermarket headunit. Provided you have an android head unit, you won't need an MMI box, to install the camera. (you're looking at a pricetag in the range ~ 350 - 450$).
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