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 (15.69 USD): Cuponation9
Coupon (15.86 USD): TTSUMMER8
Coupon (16.21 USD): BG00c906
(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): 2022ACTIESNL, Terence, Tabby20, 2203ActiesNL, BG1efeb0, 8Couponsde, MVC8SPRING, 8BGwbg2204, tRaDetRaCKeR, 8wEbgaInS5, pROMo8cuPoN, BGJUNEGSG9
(probably won’t work, but you can try them out)
Price history and price alert
Check out price history chart (for all/most countries) for FSU Optical Fiber Audio Switcher 1 In 3 Audio Splitter.
Price records source(s): Banggood
Click on image to enlarge. 
You can set price alert (for Banggood).