ATM you can buy System Security for 69.99 USD (in Banggood). Just check coupons out (with price alert and history). Do you want to know what the best price is?
Latest price update (UTC time):
Banggood (69.99 USD)
Banggood warehouse is located in China. There are no active coupons for this product, but the price is pretty low isn’t it? But wait a sec… Is it a good price? From what I can see this price is higher than average price (65.19 USD).
Link: Banggood product page
Price: 69.99 USD
Old coupons (from the oldest to the newest): BGAUGUST8, BGCAPITALOS8, BGCOUPERT8, BG8FORMULAMX
(these coupons are old, so probably won’t work)
Aliexpress
There’re some similar items on Aliexpress in my database. There may be some other items though.
| Image | Product (link) | Price | Coupons |
|---|---|---|---|
 |
Tuya WiFi Smoke Alarm Sensor | 7.96 USD | – |
More on Aliexpress… Here are coupons that you can use.
Price history and price alert
Do you need price history chart (for all/most countries) for Tuya WiFi Alarm System Security Kit 7pcs? There we go.
Price records source(s): Banggood
Click on image to enlarge. 
You can set price alert (for Banggood).