You can get AT4PW 100A Tuya WIFI Din Rail Smart Switch for $26.99 with coupon (from Banggood). Go down and check coupons out. Remember to check price history if it is available. Best price?
AT4PW 100A Tuya WIFI Din Rail Smart Switch Remote Control AC 220V 110V Digital Power Energy Volt Amp Kwh Frequency Factor Meter – WIFI version
Latest coupon code price check (UTC time):
Banggood ($26.99)
Banggood warehouse is located in China. So I have checked for active coupons (all category coupons and old ones), but there was no working coupon in Banggood. The question is – is it a good price? This price is higher than average price ($25.66) for this item.
Link: Banggood product page
Price: $26.99
Exclusive Allowance Coupons: https://bit.ly/3xWgD9k and https://couponsfromchina.com/short/5cd
Old coupons (from the oldest to the newest): BGGines, BG958665, BGTOOS729
(these coupons are old, so 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
Check out price history chart (for all/most countries) for AT4PW 100A Tuya WIFI Din Rail Smart Switch.
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)).