Aliexpress
Here are coupons that you can use.
Latest price update (UTC time):
Banggood
Banggood warehouse is located in China. Only one coupon available!
Link: Banggood product page
Coupon (25.41 USD): BGHealth06
(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): BGMiC2, vipupgrade8, BGNOS2, BG9922, BGHHH2, 0e7f33, BG2MFC, bgshOOp10, bGhOnEy10, BGHB20, BgoFErTaSchInA10, BgcLuBofErtA10, BGMSN89, 13f142, BG19561, BGCuponation10, BG97859, BGHONEY2110, BG10OFFAFF, BGMAY071, BGwhielabel, MSN0721, BG10OFFAFF1, BANGGOODSD
(I don’t think these’re gonna work, but you can try ’em out anyway)
Price history and price alert
Price history (for all/most countries) for Xiaomi Youpin MSN Electric Nose Hair Trimmer is here.
Price records source(s): Banggood
Click on image to enlarge. 
You can set price alert (for Banggood).