Aliexpress
Click here… to search for UiiSii HM6 Earphones Grey on Aliexpress
Here are coupons that you can use.
Latest price update (UTC time):
Banggood
Banggood warehouse is located in China.
Link: Banggood product page
Coupon (8.44 USD): AFfbG10
Coupon (8.72 USD): aff7off
(CouponsFromChina.com tip: just apply this code 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): TTxBG10, e2bcea, 2019SPEDM, BG3CSUM, bgssaff9
(these codes were not working in latest coupon update, but you can check them out anyway)
Price history and price alert
Here is price history (for all/most countries) for UiiSii HM6 Earphones Grey.
Price records source(s): Banggood
Click on image to enlarge. 
You can set price alert (for Banggood).