Aliexpress
Here are coupons that you can use.
Latest price update (UTC time):
Banggood
Banggood warehouse is located in China. You can get coupon down below.
Link: Banggood product page
Coupon (40.99 USD): 13f142
(CouponsFromChina.com tip: paste coupon code in your cart and click Apply 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): 50se0, 502C6B, e2bcea, TTxBG10, BG20QCY, BG3CSUM, AFfbG10, affbg10, BGCITYADS2019, BGVDay10%off, EARSP11, BGAFF10OFF, bGhOnEy10, BGSS10%SW, bgshOOp10, BG11SHOP, BG4BW25, BGLOAC1
(there’s a little possibility that old coupon will work)
Price history and price alert
Here is price history (for all/most countries) for QCY Q29 Earphones White.
Price records source(s): Banggood
Click on image to enlarge. 
You can set price alert (for Banggood).