Aliexpress
Click here… to search for Haylou GT3 TWS Bluetooth 5.0 Earphones 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 (22.99 USD): BG0a036a
Coupon (32.38 USD): BGAlerabatKL
Coupon (32.38 USD): BGd173b4
(CouponsFromChina.com tip: this code has to be applied 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): BGGT3BB, HAYLOU15, BGLOAC1, BGGT327, BGGT3BBB, BG6ad873, BGh9313, BG0d7da3, BGGT38, BGac6362, BGBuscape01, BG498ca2, BGGT3D, BGHOTSHOP15, BG53e9c8, BGYBGT3
(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 Haylou GT3 TWS Bluetooth 5.0 Earphones is here.
Price records source(s): Banggood
Click on image to enlarge. 
You can set price alert (for Banggood).