Just check coupons out (with price alert and history). What is best price?
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):
Wi-Fi Frequency 2.4GHz (Not Support 5G WIFI), Maximum Install Gap 20mm, Model DG-ZXD21, APP Name Digoo life, Operation Temperature 0~55℃, Power Supply AAA Batteryx2, Consumption <1uA@standby, Wi-Fi Protocol IEEE 802.11/b/g/n
Banggood
Banggood warehouse is located in China. We have found one coupon for this product!
Link: Banggood product page
1. ($4.84): BGSMOFF
apply code in your basket (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): BGZXD21, BGaDmITAd, BGDGZXD21, BGDigoo15%, BGBFCR01, aff7off, bGpAnDacHeCk, 2020CNY, BGVDay10%off, BGZXD211, BGSAMH, 20%DG422, BGDGDSG, BGSM15
(these coupons are old, so probably won’t work)
Price history and price alert
Here is price history (for all/most countries) for DIGOO DG-ZXD21 WIFI Door Window Sensor.
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)).