$16.99 – that is current price with coupon for Tuya WiFi Natural Gas Detector Leakage Sensor (in Banggood). Price history, coupons and price alert are available on this page. Best price?
Latest coupon code price check (UTC time):
Tuya WiFi Natural Gas Detector Leakage Sensor LED Digital Display APP Remote Alarming Voice Reminder Troubleshooting Household Security Precaution Device
Banggood ($16.99)
Banggood warehouse is located in China. Well, is it a good price anyway? Well, this price is higher than average price ($15.99) I found coupon for you. Check this out.
Link: Banggood product page
Price without coupon: $20.99
1. ($16.99): BG1e91cc
coupon code has to be applied in shop’s cart after clicking “Proceed to checkout”. Click to copy code and open shop.
Exclusive Allowance Coupons: https://bit.ly/3xWgD9k and https://couponsfromchina.com/short/5cd
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 Tuya WiFi Natural Gas Detector Leakage 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)).