$26.99 – AT4PW 100A Tuya WIFI Din Rail Smart Switch (Banggood, Aliexpress: AT4PW 100A Tuya WIFI Din Rail Smart Switch Remote Control AC 220V 110V Digital Power Energy Volt Amp Kwh Frequency Factor Meter – WIFI version (the best price with coupon)).
According to my DB the lowest price is $26.99 for AT4PW 100A Tuya WIFI Din Rail Smart Switch (in Banggood). Price history, coupons and price alert are available on this page. Best price?
Latest price update (UTC time):
Banggood ($26.99)
Banggood warehouse is located in China. There are no active coupons for this product, but the price is pretty low isn’t it? Is it a low price? Maybe there’re no more promotions for this item, because current price is higher than average (which is equal $25.66)
Link: Banggood product page
Price: $26.99
Exclusive Allowance Coupons: https://bit.ly/3xWgD9k and https://couponsfromchina.com/short/feV
Old coupons (from the oldest to the newest): BGGines, BG958665, BGTOOS729
(probably won’t work, but you can try them out)
Aliexpress
There’re some similar (or not) items on Aliexpress
You can use link bot to get even lower price:
Click here to search by yourself. Here are coupons that you can use.
Price history and price alert
Do you need price history chart (for all/most countries) for AT4PW 100A Tuya WIFI Din Rail Smart Switch? There we go. The lowest price was: $23.99.
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)).