Aliexpress
Here are coupons that you can use.
Latest coupon and price update (UTC):
Banggood
Banggood warehouse is located in China.
Link: Banggood product page
Coupon (15.99 USD): BG3672da
Coupon (16.14 USD): BG75597c
Coupon (17.28 USD): Cuponation9
(CouponsFromChina.com tip: apply it 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): BG32a41c
(these coupons are old, so probably won’t work)
Price history and price alert
Price history (for all/most countries) for AIRIS Automatic Soap Dispenser 320mL is here.
Price records source(s): Banggood
Click on image to enlarge. 
You can set price alert (for Banggood).