Aliexpress
Here are coupons that you can use.
Latest coupon code price check (UTC time):
Banggood
Banggood warehouse is located in China.
Link: Banggood product page
Coupon (13.59 USD): BGLOAC1
Coupon (14.99 USD): 13f142
(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): AFfbG10, bg20qcy, BGQCYA3, BG20QCY, 502C6B, EARSP11, bGhOnEy10, bgshOOp10, BGELIG0920, BG11SHOP, BG4BW25
(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 QCY A3 Wireless Earphone.
Price records source(s): Banggood
Click on image to enlarge. 
You can set price alert (for Banggood).