Use coupon and get Tuya WiFi Infrared PIR Motion Sensor for $14.99 (from Banggood). Price history, coupons and price alert are available on this page. Best price?
Tuya WiFi Infrared PIR Motion Sensor Security Protection Presence Sensor Detector Burglar Sound Alarm Smart Life Work with Alexa
Latest coupon code price check (UTC time):
Banggood ($14.99)
Banggood warehouse is located in China. I can’t find any active coupons for this product in Banggood. Good or bad price? Hmmm, price is higher than average (which is $14.24 right now), so better set price alert down below…
Link: Banggood product page
Price: $14.99
Exclusive Allowance Coupons: https://bit.ly/3xWgD9k and https://couponsfromchina.com/short/5cd
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
Click here to search by yourself. Here are coupons that you can use.
Price history and price alert
Price history (for all/most countries) for Tuya WiFi Infrared PIR Motion Sensor is here.
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)).