Aliexpress
Click here… to search for Xiaomi 70 Steps Smart Rearview Mirror on Aliexpress
Here are coupons that you can use.
Latest price update (UTC time):
Banggood
Banggood warehouse is located in China. There is one great coupon!
Link: Banggood product page
Coupon (378.59 USD): BANGGOODSD
(CouponsFromChina.com tip: put item in your cart and apply coupon code there 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): BgAuMotor, b71c67, BGsjcamiMars, BGbigoff, BGauto21, BGAutos, BGAFF10OFF, BGdragonBoat, BGSS10%SW, bgshOOp10, BgoFErTaSchInA10, 7bcdf9, BgcLuBofErtA10, BGCuponation10, BGHONEY2110
(you can check these old coupons out, but these probably won’t work)
Price history and price alert
Do you need price history chart (for all/most countries) for Xiaomi 70 Steps Smart Rearview Mirror? There we go.
Price records source(s): Gearbest, Banggood
Click on image to enlarge. 
You can set price alert (for Banggood).