When I was updating this page, then coupon price was $14.86 for CROSIKO BSD34EU 16A Smart WiFi EU Socket with Monitoring (in Banggood). Basically copy coupon, view price history or create e-mail price alert. Do you want to know what the best price is?
CROSIKO BSD34EU 16A Smart WiFi EU Socket APP Remote Power Monitor Timing Function Countdown Voice Control with Alexa Google Assistant – No Electricity statistics
Latest price update (UTC time):
Banggood ($14.86)
Banggood warehouse is located in China. There are no coupons for this product in Banggood. Low/high price? From what I can see this price is higher than average price ($9.74).
Link: Banggood product page
Price: $14.86
Exclusive Allowance Coupons: https://bit.ly/3xWgD9k and https://couponsfromchina.com/short/5cd
Old coupons (from the oldest to the newest): BG28ad6d
(system checks these coupons on every price check (like once per 24 hours), but you can check them out anyway)
Aliexpress
I could not find it on Aliexpress. Click here to search by yourself.
Here are coupons that you can use.
Price history and price alert
Here is price history (for all/most countries) for CROSIKO BSD34EU 16A Smart WiFi EU Socket with Monitoring.
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)).