Aliexpress
Here are coupons that you can use.
Latest coupon and price update (UTC):
Banggood
Banggood warehouse is located in China. Well, there is one coupon available right now.
Link: Banggood product page
Coupon (32.86 USD): BGAudio9
(CouponsFromChina.com tip: apply code in your basket (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): BG1b5830, BGSaleFeb8, BGSaleAD, BGAudio3, BGed9f24, BGe7dd67
(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 QCY Crossky GTR Earbuds BT5.3.
Price records source(s): Banggood
Click on image to enlarge. 
You can set price alert (for Banggood).