Just check coupons out (with price alert and history). What is best price?
Temperature Display Resolution 0.1°C / 0.1 °F, Measuring Range In Body Mode: 32°C – 43°C (89.6°F-109.4°F), Memory 32 Sets, In Surface Tem Mode: 0°C – 60°C (32°F-140°F), Material Plastic, Automatic Power-off < 30 Seconds, Accuracy ±0.3°C (±0.6°F), Precision 32°C - 34.9°C (89.6°F-94.8°F) ±0.3°C (±0.6°F), In Room Mode: 0°C - 40°C (32°F-104°F), 42.1°C - 43°C (107°F-109.4°F) ±0.3°C (±0.6°F), 2x AAA Batteries (Not Include), Model T10 - JXB311, Batteries DC 3V, Measuring Distance < 3cm, Weight 64g, Size 154x 40x 31mm, Consumption ≤300mW, 35°C - 42°C (95.0°F-107.6°F) ±0.2°C (±0.4°F), Color White
Aliexpress
There’re some similar (or not) items on Aliexpress
Click here to search by yourself. Here are coupons that you can use.
Latest price update (UTC time):
Banggood
Banggood warehouse is located in China. I can’t find any active coupons for this product in Banggood.
Link: Banggood product page
Price: $-3
It looks like this item is out of stock in Banggood. If you found it then please send me the link. I will replace it.
Click here to search on Banggood!
Exclusive Allowance Coupons: https://bit.ly/3xWgD9k and https://couponsfromchina.com/short/5cd
Price history and price alert
Do you need price history chart (for all/most countries) for Xiaomi T10 Forehead Thermometer? There we go.
Price records source(s): Gearbest, 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)).