Price history, coupons and price alert are available on this page. Let’s see what best price is ATM.
Effective Distance 3-15cm, Temperature Storage 32, Resolution 0.1℃, High Temperature Warm 38℃, Measurement Time 1 Second, Color Black, Automatic Shutdown Function 60Seconds, Weight 100g, Working Environment 16~45℃, Measurement Methods Non-Contact Infrared Temperature Measurement, Temperature Unite ℃/℉ (Optional), Size 37x 37x 138mm, Batteries 2x AAA Batteries(Not Included), Model T09, Measuring Range 32℃~42.9℃(Body Temperature)
Aliexpress
There’re some similar (or not) items on Aliexpress
Click here to search by yourself. Here are coupons that you can use.
Latest coupon and price update (UTC):
Banggood
Banggood warehouse is located in China. I am tired of searching coupons, but I found one for you…
Link: Banggood product page
1. ($25.86): BGBF20off1
paste coupon code in your cart and click Apply after clicking “Proceed to checkout”. Click to copy code and open shop)
Exclusive Allowance Coupons: https://bit.ly/3xWgD9k and https://couponsfromchina.com/short/5cd
Old coupons (from the oldest to the newest): BGT091055, BGT09EU, AFfbG10, BG99T09, BGT09PL, BGT099PL, BG89T09, BGT098, BGBINKUPON465, BGM1185B, BGBFAFF2019, BGBFM859, BGCITYADS2019, BGMBF85, BGM89T, BGT09, BGBTH895, BGBAPOHG, BGIHT0989, BGCuponation10, BGHONEY2110, 13f142
(there’s a little possibility that old coupon will work)
Price history and price alert
Check out price history chart (for all/most countries) for Xiaomi iHealth T09 Body Thermometer.
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)).