Just check coupons out (with price alert and history). Best price?
Aliexpress
There’re some similar (or not) items on Aliexpress
Click here to search by yourself. Here are coupons that you can use.
Latest coupon and price update (UTC):
Base diameter: 55mm, Degree of Protection by enclosure: IP56, Height: 335mm, Water Pressure: 0.05Mpa-0.8Mpa, Detection Zone: Factory Settings 60CM, Width: 185mm, Size: , Power and Voltage: DC.6V AC.220V-50/60Hz, Dia.of Outlet Pipe: G(1/2)”, Power Consumption: 0.5mW(DC) 2W(DC), Ambient Temperature: 0.1-45 Degress, Dia.of Inlet Pipe: G(1/2)”, Number of Handles: Hands free, Weight: about 1360g, Material: 304 Stainless Steel, Installation Holes: One Hole
Banggood
Banggood warehouse is located in China. As you can see I didn’t find any active coupon for this product right now…
Link: Banggood product page
Price: $-3
It looks like this item is out of stock in Banggood. If you found it then please send me the link. I will replace it.
Click here to search on Banggood!
Exclusive Allowance Coupons: https://bit.ly/3xWgD9k and https://couponsfromchina.com/short/5cd
Old coupons (from the oldest to the newest): 7d18f7, BGCuponation10, 13f142, BGHONEY2110
(these codes were not working in latest coupon update, but you can check them out anyway)
Price history and price alert
Check out price history chart (for all/most countries) for Touch Automatic Sink Tap Basin Faucet.
Price records source(s): Banggood
Click on image to enlarge. 
You can set price alert (for Banggood and Aliexpress (only if product name will be the same as on Banggood and I will post it on social media though, so it’s more like Banggood price alert)).