$55.99 – 1x Connection Cable, 1x Accessory, 2x Door Sensor Set, 1x English User Manual, Package Contents: 1x Alarm, 1x Infrared Detector, 2x Remote Control, 1x Bag of Screws, 1x Power Adapter, 1x Data Cable.
I have just checked coupons. The lowest price I could get is $55.99 for PG-105 433MHz Smart Home System (in Banggood). Price history, coupons and price alert are available on this page. Best price?
Latest price update (UTC time):
Banggood ($55.99)
Banggood warehouse is located in China. There are no active coupons for this product, but the price is pretty low isn’t it? Is it cheap? It’s a good price, isn’t it? The average is $56.32.
Link: Banggood product page
Price: $55.99
Additional Banggood coupons: first page and second page
Aliexpress
There’re some similar (or not) items on Aliexpress
You can use link bot to get even lower price:
| Image | Product (link) | Price | Coupons |
|---|---|---|---|
 |
YAOSHENG Security-Protection TUYA Smart Home Alarm System 2G 433MHz WiFi GSM Wireless House App Control Sets PG105 | $1.59 | – |
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 PG-105 433MHz Smart Home System. The lowest price was: $54.99.
Price records source(s): Gearbest, 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)).