Xiaomi Zero Limited Position Smart Sensor (Banggood, Aliexpress: Size 62.5x62mm, Smart version wireless connection Wi-Fi IEE802.11B/G/N 2.4GHz, Working temperature -20℃~50℃, Working humidity 10%-90%RH, Color White, Battery AA 1.5V（Alkaline dry cell）, Waterproof level IP33, Rated input 3V-0.2A (the best price with coupon)).
Get coupons, create price alert or check price history out! Do you want to know what the best price is?
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. Well, there is one coupon available right now.
Link: Banggood product page
1. ($21.99): 13f142
you should apply the coupon in your cart 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): BGHWDEALS, BGCuponation10
(these coupons are old, so probably won’t work)
Price history and price alert
Do you need price history chart (for all/most countries) for Xiaomi Zero Limited Position Smart Sensor? There we go. The lowest price was: $19.99.
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)).