AUTO-VOX M6 Dash Cam Backup Camera Kit | $76 | Amazon | Use code Q88XKGN3

You don’t need to buy a new car to get a life-changing backup camera, you just need $76 (with promo code Q88XKGN3), and a few minutes to run the wires. This model attaches to your license plate, and runs to a special rear view mirror that attaches in front of your existing mirror.

Oh, about that mirror...it has a dash cam built into it! Just pop in a microSD card, and you have a backup camera, plus a dual-lens dash cam to record any accidents.