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 (48.00 USD): 7d18f7
Coupon (48.00 USD): BGSS10%SW
(CouponsFromChina.com tip: coupon code has to be applied in shop’s 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): 91645b, 502C6B, e2bcea, TTxBG10, f8aaf1, BGss506, BG3CSUM, AFfbG10, BGBK15, BGBAK15, bGhOnEy10, bgshOOp10
(I don’t think these’re gonna work, but you can try ’em out anyway)
Price history and price alert
Price history (for all/most countries) for Bakeey Bluetooth 5.0 TWS Earphones is here.
Price records source(s): Banggood
Click on image to enlarge. 
You can set price alert (for Banggood).