$50.99 – Tuya WiFi 4G EU GSM Smart Security Alarm System 433MHz (Banggood, Aliexpress: Tuya WiFi 4G EU GSM Smart Security Alarm System 433MHz Timing Function Two-way Intercom APP Remote Alarm Notification Digital Burglar Kit (the best price with coupon)).
I have checked all old coupons and price is $50.99 for Tuya WiFi 4G EU GSM Smart Security Alarm System 433MHz (in Banggood). Go down and check coupons out. Remember to check price history if it is available. You probably want to know what is the best price?
Latest coupon and price update (UTC):
Banggood ($50.99)
Banggood warehouse is located in China. There are no coupons for this product in Banggood. Well, is it a good price anyway? From what I can see this price is higher than average price ($49.99).
Link: Banggood product page
Price: $50.99
Exclusive Allowance Coupons: https://bit.ly/3xWgD9k and https://couponsfromchina.com/short/5cd
Old coupons (from the oldest to the newest): BGRAUGTGSM
(I don’t think these’re gonna work, but you can try ’em out anyway)
Aliexpress
There’re some similar (or not) items on Aliexpress
Click here to search by yourself. Here are coupons that you can use.
Price history and price alert
Check out price history chart (for all/most countries) for Tuya WiFi 4G EU GSM Smart Security Alarm System 433MHz. The lowest price was: $49.99.
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)).