Amazon has Hikity Wireless Carplay Android Auto Portable Car Stereo and backup camera (https://www.amazon.com/gp/product/B0C3R5NW76/ref=sw_img_1?tag=quackdeals-20) (10.26" HD Car Play Screen with 2.5K Dash Cam, 1080P Backup Cam, 64G) for just $69.99 (originally $89.99) after stacking a $20 coupon. Free shipping!. The price is unbeatable for a feature-packed stereo that includes a backup camera and all the installation necessities.
(https://m.media-amazon.com/images/I/71QUUKcq6xL._AC_SX679_.jpg)