Aliexpress
Click here… to search for Automatic Foaming Soap Dispenser on Aliexpress
Here are coupons that you can use.
Latest coupon and price update (UTC):
Banggood
Banggood warehouse is located in China. I am tired of searching coupons, but I found one for you…
Link: Banggood product page
Coupon (35.09 USD): TTxBG10
(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): XMSD93, Alibuy9136, 502C6B, vipupgrade8
(there’s a little possibility that old coupon will work)
Price history and price alert
Check out price history chart (for all/most countries) for Automatic Foaming Soap Dispenser.
Price records source(s): Gearbest, Banggood
Click on image to enlarge. 
You can set price alert (for Banggood).