When I was updating this page, then coupon price was $129.99 for Wireless GSM Burglar Alarm Tuya Smart Home Alarm System Kit (in Banggood). Price history, coupons and price alert are available on this page. Best price?
Wireless GSM Burglar Alarm Tuya Smart Home WiFi Alarm System Kit Multifuctional Anti-theft Security Device Kit with Alexa Google
Latest coupon code price check (UTC time):
Banggood ($129.99)
Banggood warehouse is located in China. Hmmm… There is no active coupon in Banggood at this moment. You probably want to know if this is a good price. This price is higher than average price ($115.89) for this item.
Link: Banggood product page
Price: $129.99
Exclusive Allowance Coupons: https://bit.ly/3xWgD9k and https://couponsfromchina.com/short/5cd
Old coupons (from the oldest to the newest): BGAUGUST8, BGCAPITALOS8, BGCOUPERT8, BG8FORMULAMX
(these codes were not working in latest coupon update, but you can check them 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
Do you need price history chart (for all/most countries) for Wireless GSM Burglar Alarm Tuya Smart Home Alarm System Kit? There we go.
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)).