Latest update shows that MoesHouse Tuya Bluetooth 3 costs 39.99 USD (in Banggood). Go down and check coupons out. Remember to check price history if it is available. You probably want to know what is the best price?
Latest coupon code price check (UTC time):
Banggood (39.99 USD)
Banggood warehouse is located in China. I’m afraid that there’s no working coupon in Banggood. The question is – is it a good price? Pretty good price – average (40.00 USD) is higher than current one!
Link: Banggood product page
Price: 39.99 USD
Exclusive Allowance Coupons: https://bit.ly/3xWgD9k
Old coupons (from the oldest to the newest): BG589b2e, BGCZBP111
(you can check these old coupons out, but these probably won’t work)
Aliexpress
Click here… to search for MoesHouse Tuya Bluetooth 3 in 1 Air Monitor Carbon Dioxide Sensor on Aliexpress
Here are coupons that you can use.
Price history and price alert
Here is price history (for all/most countries) for MoesHouse Tuya Bluetooth 3 in 1 Air Monitor Carbon Dioxide Sensor.
Price records source(s): Banggood
Click on image to enlarge. 
You can set price alert (for Banggood).