Aliexpress
Click here… to search for Xiaomi Noise Cancellation Earphones Type-C White 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 (77.07 USD): Email5
(CouponsFromChina.com tip: you should apply the coupon 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): cd0ff9, e2bcea, TTxBG10, 2019SPEDM, BG3CSUM, AFfbG10, 502C6B, EARSP11, BGAFF10OFF, bGhOnEy10
(I don’t think these’re gonna work, but you can try ’em out anyway)
Price history and price alert
Check out price history chart (for all/most countries) for Xiaomi Noise Cancellation Earphones Type-C White.
Price records source(s): Gearbest, Banggood
Click on image to enlarge. 
You can set price alert (for Banggood).