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 code price check (UTC time):
Banggood
Banggood warehouse is located in China. There is one great coupon!
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)
Old coupons (from the oldest to the newest): BG6c9335, BGSCM75, BG091901, BGCarDVR1, BGCarEle5, BGSCM11, BG845979, BGLMQ15, BGCAR639, BG72cc1e
(I don’t think these’re gonna work, but you can try ’em out anyway)
Price history and price alert
Do you need price history chart (for all/most countries) for A900 4K 1080P Dash Cam with Rear Cam? There we go.
Price records source(s): Banggood
Click on image to enlarge. 
You can set price alert (for Banggood).