When I was updating this page the price was $25.29 for Tuya Wifi Natural Gas Sensor (in Banggood). You can create price alert here, copy coupons and view price history. You probably want to know what is the best price?
Tuya Wifi Natural Gas Sensor EU Combustible Household Smart LPG Gas Alarm Detector Leakage Sensor Fire Safety Smart Home
Latest coupon code price check (UTC time):
Banggood ($25.29)
Banggood warehouse is located in China. There are no active coupons for this product, but the price is pretty low isn’t it? I think you want to know if the price is good. Well, this price is higher than average price ($17.49)
Link: Banggood product page
Price: $25.29
Exclusive Allowance Coupons: https://bit.ly/3xWgD9k and https://couponsfromchina.com/short/5cd
Old coupons (from the oldest to the newest): BG589b2e
(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 Natural Gas 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)).