You can get Tuya WiFi Intelligent Circuit Breaker 1P 63A Energy Monitor for $14.99 using coupon code (in Banggood). Basically copy coupon, view price history or create e-mail price alert. Best price?
Tuya WiFi Intelligent Circuit Breaker 1P 63A Energy Monitor Real-time Tracking Energy Consumption with Alexa Google Assistant Compatibility Remote Control for Home Office Apartment
Latest coupon and price update (UTC):
Banggood ($14.99)
Banggood warehouse is located in China. Too bad there’s no coupon right now in Banggood. Is it a reasonable price for this item? IMHO this is a good price, coz it’s lower than average ($15.24)
Link: Banggood product page
Price: $14.99
Exclusive Allowance Coupons: https://bit.ly/3xWgD9k and https://couponsfromchina.com/short/5cd
Old coupons (from the oldest to the newest): BGa8a7ff
(you can check these old coupons out, but these probably won’t work)
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 Intelligent Circuit Breaker 1P 63A Energy Monitor.
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)).