Aliexpress
Click here… to search for Xiaomi Sport Earbuds Mini Version on Aliexpress
Here are coupons that you can use.
Latest price update (UTC time):
Banggood
Banggood warehouse is located in Hong Kong.
Link: Banggood product page
Coupon (13.99 USD): BG3d3ed6
Coupon (25.31 USD): BGAudio3
(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): b4e555, 0e7f33, AFfbG10, BGMPB2020, BGAFF10OFF, BGXMMIC, bGhOnEy10, BGSS10%SW, bgshOOp10, BGELIG0920, BG4BW25, BGLOAC1, 13f142, BGa0b145, 6GSGIT, BGBRPL2, BGHOTSHOP15, BG53e9c8, BGAlerabatKL, BGd173b4, BGAudioVideo, BGAUDIO, BG9ba0e8, BG1b5830
(these codes were not working in latest coupon update, but you can check them out anyway)
Price history and price alert
Check out price history chart (for all/most countries) for Xiaomi Sport Earbuds Mini Version.
Price records source(s): Gearbest, Banggood
Click on image to enlarge. 
You can set price alert (for Banggood).