According to my DB the lowest price is 17.99 USD for Smart ZB (in Banggood). Check coupons or create price alert down below. You probably want to know what is the best price?
Latest coupon and price update (UTC):
Banggood (17.99 USD)
Banggood warehouse is located in China. I don’t think there is an active coupon right now – at least in my database. I think you want to know if the price is good. Well, this price is higher than average price (14.01 USD)
Link: Banggood product page
Price: 17.99 USD
Exclusive Allowance Coupons: https://bit.ly/3xWgD9k
Old coupons (from the oldest to the newest): Cuponation9, BG5eeb84
(system checks these coupons on every price check (like once per 24 hours), but you can check them out anyway)
Other warehouses/versions
This item is available in 1 another warehouse/version!
1. Europe – Tuya Smart ZB Temperature Humidity Sensor [EU] (-3 USD)
Aliexpress
Click here… to search for Tuya Smart ZB Temperature Humidity Sensor on Aliexpress
Here are coupons that you can use.
Price history and price alert
Here is price history (for all/most countries) for Tuya Smart ZB Temperature Humidity Sensor.
Price records source(s): Banggood
Click on image to enlarge. 
You can set price alert (for Banggood).