YI Mirror Dash Cam/Rear View Camera | $60 | Amazon | Promo code CJBRVBPM
Photo: Amazon
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You don’t need to buy a new car to get a life-changing backup camera, you just need $60 (with promo code CJBRVBPM), 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.