$9.99 – Ewelink Smart Zigbe Temperature Humidity Sensor LCD Display Thermometer Hygrometer APP Remote Control Real-time Monitoring Work with Alexa Google Home – White.
You can get Ewelink Smart Zigbee Temperature Humidity Sensor for $9.99 using coupon code (in Banggood). You can create price alert here, copy coupons and view price history. You probably want to know what is the best price?
Latest coupon code price check (UTC time):
Banggood ($9.99)
Banggood warehouse is located in China. Price? Wow! That’s the lowest price in CouponsFromChina database! There is one great coupon!
Link: Banggood product page
Price without coupon: $10.99
1. ($9.99): BGad9e6b
put item in your cart and apply coupon code there after clicking “Proceed to checkout”. Click to copy code and open shop.
Additional Banggood coupons: first page and second page
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
Check out price history chart (for all/most countries) for Ewelink Smart Zigbee Temperature Humidity Sensor. 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)).