$9.99 – Tuya WiFi Smart Carbon Monoxide Detector (Banggood, Aliexpress: Tuya WiFi Smart Carbon Monoxide Detector Alarm 85dB Sound Warning LCD Digital Display Home Indoor CO Poisoning Siren (the best price with coupon)).
When I was updating this page the price was $9.99 for Tuya WiFi Smart Carbon Monoxide Detector (in Banggood). Basically copy coupon, view price history or create e-mail price alert. What is best price?
Latest coupon and price update (UTC):
Banggood ($9.99)
Banggood warehouse is located in China. I couldn’t find any coupon for this product on latest product update. Is it expensive? This is the best price in history according to CouponsFromChina database!
Link: Banggood product page
Price: $9.99
This is the best price ever noted in my database!
Exclusive Allowance Coupons: https://bit.ly/3xWgD9k and https://couponsfromchina.com/short/5cd
Old coupons (from the oldest to the newest): BG662cb9
(there’s a little possibility that old coupon will 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
Do you need price history chart (for all/most countries) for Tuya WiFi Smart Carbon Monoxide Detector? There we go. The lowest price was: $9.99.
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)).