$12.99 – Tuya WiFi Infrared Motion Sensor (Banggood, Aliexpress: Tuya Smart WiFi Infrared Detectors Sensor Alarm System Motion Detector PIR Sensor Alarm Smart Life APP Remote Control (the best price with coupon)).
When I was updating this page, then coupon price was $12.99 for Tuya WiFi Infrared Motion Sensor (in Banggood). Check coupons or create price alert down below. Best price?
Latest coupon and price update (UTC):
Banggood ($12.99)
Banggood warehouse is located in China. CouponsFromChina software could not find any coupon for this product in Banggood. But wait a sec… Is it a good price? Well, this price is higher than average price ($12.40)
Link: Banggood product page
Price: $12.99
Exclusive Allowance Coupons: https://bit.ly/3xWgD9k and https://couponsfromchina.com/short/feV
Old coupons (from the oldest to the newest): BG589b2e
(you can check these old coupons out, but these 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
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)).