According to my DB the lowest price is 18.99 USD for Tuya WiFi Smart Carbon Monoxide Detector (in Banggood). Get coupons, create price alert or check price history out! Do you want to know what the best price is?
Latest coupon and price update (UTC):
Banggood (18.99 USD)
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. This price is higher than average price (18.84 USD) for this item.
Link: Banggood product page
Price: 18.99 USD
Exclusive Allowance Coupons: https://bit.ly/3xWgD9k
There were country-specific coupon codes published on Couponsfromchina social channels and price alerts. Coupon price may vary by country, because there’re different VAT rates, shipping cost etc. There is a chance that some latest coupons are still working:
Coupon (9.4.2024, $16.99): BGRAPTSCM
Item: Tuya WiFi Smart Carbon Monoxide Detector
Countries: Greece
Old coupons (from the oldest to the newest): BG662cb9
(you can check these old coupons out, but these probably won’t work)
Aliexpress
There’re some similar items on Aliexpress in my database. There may be some other items though.
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Here are coupons that you can use.
Price history and price alert
Check out price history chart (for all/most countries) for Tuya WiFi Smart Carbon Monoxide Detector.
Price records source(s): Banggood
Click on image to enlarge. 
You can set price alert (for Banggood).