Aliexpress
Here are coupons that you can use.
Latest price update (UTC time):
Banggood
Banggood warehouse is located in China.
Link: Banggood product page
Coupon (33.38 USD): BGAlerabat1
Coupon (36.91 USD): BG00c906
(CouponsFromChina.com tip: this code has to be applied in your 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): BGFUE985, BGdragonBoat, BGSS10%SW, bGhOnEy10, bgshOOp10, BGHome15%, BGHALLOWEEN, BGHOMEA15%, BgcLuBofErtA10, BGAFF10OFF, BGCuponation10, 13f142, BGHONEY2110, BANGGOODSD, 00c906
(these codes were not working in latest coupon update, but you can check them out anyway)
Price history and price alert
Here is price history (for all/most countries) for Xiaomi FIVE Automatic Ozone Deodorizer.
Price records source(s): Banggood
Click on image to enlarge. 
You can set price alert (for Banggood).