When I was updating this page, then coupon price was 26.99 USD for AT4PW 100A Tuya WIFI Din Rail Smart Switch (in Banggood). Go down and check coupons out. Remember to check price history if it is available. You probably want to know what is the best price?
Latest coupon code price check (UTC time):
Banggood (26.99 USD)
Banggood warehouse is located in China. I can’t find any active coupons for this product in Banggood. Is it good price? This price is higher than average price (25.66 USD) for this item.
Link: Banggood product page
Price: 26.99 USD
Exclusive Allowance Coupons: https://bit.ly/3xWgD9k
Old coupons (from the oldest to the newest): BGGines, BG958665, BGTOOS729
(these coupons are old, so probably won’t work)
Aliexpress
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).