$59.99 – Tuya WiFi 3P4W Electric Energy Meter (Banggood, Aliexpress: Tuya WiFi 3P4W Electric Energy Meter Three Phase Reclosure Switch Intelligent Reclosing Protector (the best price with coupon)).
When I was updating this page, then coupon price was $59.99 for Tuya WiFi 3P4W Electric Energy Meter (in Banggood). You can create price alert here, copy coupons and view price history. Let’s see what best price is ATM.
Latest coupon code price check (UTC time):
Banggood ($59.99)
Banggood warehouse is located in China. I don’t think there is an active coupon right now – at least in my database. Low/high price? According to my database, the average price is $61.02 and current price is $59.99, so it’s probably a good price!
Link: Banggood product page
Price: $59.99
Exclusive Allowance Coupons: https://bit.ly/3xWgD9k and https://couponsfromchina.com/short/5cd
Aliexpress
There’re some similar (or not) items 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 Tuya WiFi 3P4W Electric Energy Meter. The lowest price was: $57.99.
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)).