Aliexpress
Click here… to search for Xiaomi QCY L2 Bluetooth 5.0 Earphones on Aliexpress
Here are coupons that you can use.
Latest price update (UTC time):
Banggood
Banggood warehouse is located in China. There is no active coupon in my database right now (for Banggood).
Link: Banggood product page
Price: -3 USD
It looks like this item is out of stock in Banggood. If you found it then please send me the link. I will replace it.
Click here to search on Banggood!
Old coupons (from the oldest to the newest): BGQBGL2IN, BWQbgssaff9, AFfbG10, BG20QCY, BGQCYL2, 502C6B, d3ea27, 0e7f33, bgshOOp10, BGELIG0920, BG4BW25, BGLOAC1, 13f142
(you can check these old coupons out, but these probably won’t work)
Price history and price alert
Here is price history (for all/most countries) for Xiaomi QCY L2 Bluetooth 5.0 Earphones.
Price records source(s): Banggood
Click on image to enlarge. 
You can set price alert (for Banggood).