Aliexpress
Click here… to search for Xiaomi Noise Cancellation Earphones Black on Aliexpress
Here are coupons that you can use.
Latest coupon and price update (UTC):
Banggood
Banggood warehouse is located in Hong Kong.
Link: Banggood product page
Coupon (62.55 USD): BGAlerabatKL
Coupon (62.55 USD): BGAUDIO
(CouponsFromChina.com tip: paste coupon code in your cart and click Apply 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): cd0ff9, e2bcea, TTxBG10, 2019SPEDM, BG3CSUM, AFfbG10, 502C6B, BGBFAFF2019, BGCITYADS2019, Email5, BGVDay10%off, BGHKHK, BGAFF10OFF, bGhOnEy10, 7d18f7, BGSS10%SW, BGXM722C, bgshOOp10, BGELIG0920, BG11SHOP, BG4BW25, BGLOAC1, 13f142, BGa0b145, 6GSGIT, BGBRPL2, BGHOTSHOP15, BG53e9c8, BGd173b4, BGAudioVideo
(there’s a little possibility that old coupon will work)
Price history and price alert
Check out price history chart (for all/most countries) for Xiaomi Noise Cancellation Earphones Black.
Price records source(s): Gearbest, Banggood
Click on image to enlarge. 
You can set price alert (for Banggood).