$39.99 – MoesHouse Tuya bluetooth Smart Air Quality Carbon Dioxide Detector with Alarm Clock Temperature Humidity Air Tester APP Remote Wireless Monitor.
ATM you can buy MoesHouse Tuya Bluetooth Smart Air Quality Carbon Dioxide Detector for $39.99 (in Banggood). Price history, coupons and price alert are available on this page. Do you want to know what the best price is?
Latest coupon code price check (UTC time):
Banggood ($39.99)
Banggood warehouse is located in China. So I have checked for active coupons (all category coupons and old ones), but there was no working coupon in Banggood. Is it a reasonable price for this item? Well, according to CouponsFromChina database this price is the best in history (5 records).
Link: Banggood product page
Price: $39.99
This is the best price ever noted in my database!
Exclusive Allowance Coupons: https://bit.ly/3xWgD9k and https://couponsfromchina.com/short/i1u
Old coupons (from the oldest to the newest): BGRSEPTMOES4, BG15ab24
(probably won’t work, but you can try them out)
Aliexpress
There’re some similar (or not) items on Aliexpress
You can use link bot to get even lower price:
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 MoesHouse Tuya Bluetooth Smart Air Quality Carbon Dioxide Detector. The lowest price was: $39.99.
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)).