When I was updating this page, then coupon price was $31.04 for Tuya Wifi Smart Natural Gas Alarm Sensor (in Banggood). You can create price alert here, copy coupons and view price history. Let’s see what best price is ATM.
Latest coupon and price update (UTC):
Tuya Wifi Smart Natural Gas Alarm Sensor With temperature function Combustible Gas Leak Detector LCD Display Smart Life App – EU Plug
Banggood ($31.04)
Banggood warehouse is located in China. There is no active coupon in my database right now (for Banggood). You probably want to know if this is a good price. Maybe there’re no more promotions for this item, because current price is higher than average (which is equal $17.25)
Link: Banggood product page
Price: $31.04
Exclusive Allowance Coupons: https://bit.ly/3xWgD9k and https://couponsfromchina.com/short/5cd
Old coupons (from the oldest to the newest): BG589b2e
(sometimes old coupons work, so you can check them out (this site checks them on every price update))
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 Smart Natural Gas Alarm Sensor.
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)).