Aliexpress
Click here… to search for A900 4K 1080P Dash Cam with Rear Cam on Aliexpress
Here are coupons that you can use.
Latest coupon and price update (UTC):
Banggood
Banggood warehouse is located in China. I am tired of searching coupons, but I found one for you…
Link: Banggood product page
Coupon (39.99 USD): BG64d570
(CouponsFromChina.com tip: apply code in your basket (cart) after clicking “Proceed to checkout”. Click to copy code and open shop)
Exclusive Allowance Coupons: https://bit.ly/3xWgD9k
Old coupons (from the oldest to the newest): BG6c9335, BGSCM75, BG091901, BGCarDVR1, BGCarEle5, BGSCM11, BG845979, BGLMQ15, BGCAR639, BG72cc1e
(you can check these old coupons out, but these probably won’t work)
Price history and price alert
Price history (for all/most countries) for A900 4K 1080P Dash Cam with Rear Cam is here.
Price records source(s): Banggood
Click on image to enlarge. 
You can set price alert (for Banggood).