Basically copy coupon, view price history or create e-mail price alert. Let’s see what best price is ATM.
Transmit distance: 150m (open)
Aliexpress
There’re some similar (or not) items on Aliexpress
| Image | Product (link) | Price | Coupons |
|---|---|---|---|
 |
Sonoff RF Brigde WiFi 433Mhz Wireless Signal Converter DW1 Door Sensor PIR2 PIR Motion Sensor for Smart Home | $6.76 | – |
Click here to search by yourself. Here are coupons that you can use.
Latest coupon code price check (UTC time):
Banggood
Banggood warehouse is located in China.
Link: Banggood product page
1. ($8.02): BGSTHO15
2. ($8.50): BGAFF10OFF
you should apply the coupon in your cart after clicking “Proceed to checkout”. Click to copy code and open shop.
Exclusive Allowance Coupons: https://bit.ly/3xWgD9k and https://couponsfromchina.com/short/5cd
Old coupons (from the oldest to the newest): elec, e2bcea, BG15Gadgets, SONOFF15, BG9NY, BGVDay10%off, BGTT10, bGhOnEy10, BGSMOFF, BGSONOFF15, BGELIG0920, 13f142, BgcLuBofErtA10, BGSONOFF16, BGCuponation10, BGHONEY2110, BG15Sonoff
(these coupons are old, so probably won’t work)
Other warehouses/versions
This item is available in 1 another warehouse/version!
1. Europe – SONOFF PIR2 Motion Sensor [EU/UK] ($-3)
Price history and price alert
Here is price history (for all/most countries) for SONOFF PIR2 Motion Sensor.
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)).