$12.99 – Tuya Smart WiFi Infrared Detectors Sensor Alarm System Motion Detector PIR Sensor Alarm Smart Life APP Remote Control.
According to my DB the lowest price is $12.99 for Tuya WiFi Infrared Motion Sensor (in Banggood). You can create price alert here, copy coupons and view price history. Let’s see what best price is ATM.
Latest price update (UTC time):
Banggood ($12.99)
Banggood warehouse is located in China. I’m afraid that there’s no working coupon in Banggood. Is it good price? Well, this price is higher than average price ($12.40)
Link: Banggood product page
Price: $12.99
Additional Banggood coupons: first page and second page
Old coupons (from the oldest to the newest): BG589b2e
(system checks these coupons on every price check (like once per 24 hours), but you can check them out anyway)
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
Here is price history (for all/most countries) for Tuya WiFi Infrared Motion Sensor. The lowest price was: $11.99.
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)).