$82.99 – Smart Tuya WiFi Security Alarm System Kit (Banggood, Aliexpress: Smart Tuya WiFi Security Alarm System Kit Wireless GSM Burglar Alarm Home Anti-theft Security System Assisted with Alexa Google (the best price with coupon)).
You can get Smart Tuya WiFi Security Alarm System Kit for $82.99 with coupon (from Banggood). You can create price alert here, copy coupons and view price history. Let’s see what best price is ATM.
Latest coupon and price update (UTC):
Banggood ($82.99)
Banggood warehouse is located in China. I don’t think there is an active coupon right now – at least in my database. You probably want to know if this is a good price. It looks like it’s a good price (lower than average ($89.54)).
Link: Banggood product page
Price: $82.99
Exclusive Allowance Coupons: https://bit.ly/3xWgD9k and https://couponsfromchina.com/short/feV
Old coupons (from the oldest to the newest): BGXIFD357, BGAUGUST8, BGCAPITALOS8, BGCOUPERT8, BG0a9605, BGROTSGSM
(these coupons are old, so probably won’t work)
Aliexpress
There’re some similar (or not) items on Aliexpress
You can use link bot to get even lower price:
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 Smart Tuya WiFi Security Alarm System Kit. The lowest price was: $79.99.
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)).