You can get Mijia Smart Door Window for 13.99 USD with coupon (from Banggood). You can create price alert here, copy coupons and view price history. You probably want to know what is the best price?
Latest price update (UTC time):
Banggood (13.99 USD)
Banggood warehouse is located in Hong Kong. I don’t think there is an active coupon right now – at least in my database. The question is – is it a good price? Hmmm, price is higher than average (which is 12.79 USD right now), so better set price alert down below…
Link: Banggood product page
Price: 13.99 USD
Exclusive Allowance Coupons: https://bit.ly/3xWgD9k
Old coupons (from the oldest to the newest): 13f142, BGXMNEWD, BGSAMRTH, BGLTPX5ND, BgcLuBofErtA10, BGXMDS2, BG15SH12, BG2020FRM, BGSTHO15, BGXM2002, BGXMDSO, BGHONEY2110, BGSHOM15, 6GSGIT, BGf38540, BGD11038, BG616162, BGB5046, BG3c2af1
(there’s a little possibility that old coupon will work)
Aliexpress
There’re some similar items on Aliexpress in my database. There may be some other items though.
| Image | Product (link) | Price | Coupons |
|---|---|---|---|
 |
Xiaomi Mijia Smart USB/Battery Mosquito Dispeller 2 WX10ZM | 19.05 USD | – |
 |
Xiaomi Mijia Bluetooth Smart Hygrometer Thermometer | 19.53 USD | – |
 |
3x Xiaomi Mijia Smart Thermometer 2 Temperature Humidity Sensor | 21.86 USD | – |
 |
Xiaomi Mijia Smart Pump 2 MJCQB06QW | 31.35 USD | – |
 |
Xiaomi Mijia Smart Pump 2 MJCQB06QW | 34.04 USD | – |
 |
Xiaomi Mijia Smart Pump 2 MJCQB06QW | 38.75 USD | – |
 |
Xiaomi Mijia Smart Pump 2 MJCQB06QW | 40.25 USD | – |
 |
Xiaomi Mijia Smart Pump 2 MJCQB06QW | 42.92 USD | – |
 |
Xiaomi Mijia Smart Pump 2 MJCQB06QW | 43.02 USD | – |
 |
Xiaomi Mijia Smart Pump 2 MJCQB06QW | 43.02 USD | – |
 |
Xiaomi Mijia Smart Pump 2 MJCQB06QW | 43.95 USD | – |
 |
Xiaomi Mijia Smart Pump 2 MJCQB06QW | 48.17 USD | – |
 |
Xiaomi MIJIA Smart Electric Water Kettle 2 Pro | 59.00 USD | – |
More on Aliexpress… Here are coupons that you can use.
Price history and price alert
Here is price history (for all/most countries) for Xiaomi Mijia Smart Door Window Sensor 2.
Price records source(s): Banggood
Click on image to enlarge. 
You can set price alert (for Banggood).