You can get Tuya Zigbee WiFi Temperature Humidity Monitor for $7.49 using coupon code (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 price update (UTC time):
Tuya WiFi Temperature Humidity Tester Digital Display Mobilephone APP Remotely Control Intelligent Linkage Hygrothermograph Smarthome Device – 1 PC zigbee Version
Banggood ($7.49)
Banggood warehouse is located in China. Too bad there’s no coupon right now in Banggood. What about the price? Looks like a good price to me (average is $8.24).
Link: Banggood product page
Price: $7.49
Exclusive Allowance Coupons: https://bit.ly/3xWgD9k and https://couponsfromchina.com/short/5cd
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
Check out price history chart (for all/most countries) for Tuya Zigbee WiFi Temperature Humidity Monitor.
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)).