Price history, coupons and price alert are available on this page. Let’s see what best price is ATM.
Rated voltage: AC100 – 250V, Wireless frequency: WiFi 2.4G Hz, APP name: Smart Life, Material: PC + ABS + V0 (flame-resistant material), IT1R, Supported system: iOS 8.0 / Android, Rated current: 16A (max.)
Aliexpress
I could not find it on Aliexpress. Click here to search by yourself.
Here are coupons that you can use.
Latest coupon and price update (UTC):
Price history and price alert
Do you need price history chart (for all/most countries) for Gocomma WS017-EU Double Sockets Smart WiFi Plug? There we go.
Price records source(s): Gearbest
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)).