Aliexpress
Click here… to search for Xiaomi Happy Life XY LED Makeup Mirror on Aliexpress
Here are coupons that you can use.
Latest coupon and price update (UTC):
Banggood
Banggood warehouse is located in China.
Link: Banggood product page
Coupon (37.43 USD): BGHONEY2110
Coupon (37.43 USD): BG10OFFAFF
Coupon (40.59 USD): 13f142
(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): bgssaff9, AFfbG10, BGhardware, BG2780, BGplxy2in1, BGXY2IN1PL, BGBFAFF2019, BG0450, BGCITYADS2019, BG2020NS, BGVDay10%off, BGAFF10OFF, bGhOnEy10, BGdragonBoat, BGSS10%SW, bgshOOp10, BGHWDEALS, BgoFErTaSchInA10, BgcLuBofErtA10, BGCuponation10
(these coupons are old, so probably won’t work)
Price history and price alert
Check out price history chart (for all/most countries) for Xiaomi Happy Life XY LED Makeup Mirror.
Price records source(s): Banggood
Click on image to enlarge. 
You can set price alert (for Banggood).