Just check coupons out (with price alert and history). You probably want to know what is the best price?
DDR 2GB, OS Android 8.1, Front Camera 1080P(The file is compressed to 720P), Language Multilanguage supported, Full touch screen 7 inch, Video format recorded TS/MP4, Rear Camera 1080P, FM transmittor Support, bluetooth Support hands-free and music, WIFI Support, G-SENSOR Support, GPS navigation GPS + Beidou, Voice recording Support, EMMC Flash 16GB, Full screen display & ADAS Full screen display + ADAS safe warning system, 4G and hotspot Sharing hot spot to any device needed, Video recorder & navigation High definition DVR, Full screen rear camera image for parking Support
Aliexpress
There’re some similar (or not) items on Aliexpress
Click here to search by yourself. Here are coupons that you can use.
Latest price update (UTC time):
Banggood
Banggood warehouse is located in Hong Kong. One coupon is available. Cool!
Link: Banggood product page
1. ($128.69): BGAMMT03
you should apply the coupon in your cart after clicking “Proceed to checkout”. Click to copy code and open shop)
Exclusive Allowance Coupons: https://bit.ly/3xWgD9k and https://couponsfromchina.com/short/5cd
Old coupons (from the oldest to the newest): 00c906, BG1efeb0, MVC8SPRING, BGNEWYEAR8
(system checks these coupons on every price check (like once per 24 hours), but you can check them out anyway)
Price history and price alert
Check out price history chart (for all/most countries) for K7 7 Inch 4G Android 8.1 FHD 1080P 4G Car DVR Dash Cam.
Price records source(s): Banggood
Click on image to enlarge. 
You can set price alert (for Banggood and Aliexpress (only if product name will be the same as on Banggood and I will post it on social media though, so it’s more like Banggood price alert)).