$9.53 – SONOFF MINI R4 Wifi Switch Module Smart Wi-Fi Two Way Switch Smart Home Works R5 S-MATE Wireless Control Alexa Google Home.
SONOFF MINI R4 Wifi Switch Module is for $9.53 (in Banggood). Just check coupons out (with price alert and history). Best price?
Latest price update (UTC time):
Banggood ($9.53)
Banggood warehouse is located in China. Low/high price? IMHO this is a good price, coz it’s lower than average ($10.09) I found coupon for you. Check this out.
Link: Banggood product page
Price without coupon: $10.99
1. ($9.53): BG81b743
put item in your cart and apply coupon code there after clicking “Proceed to checkout”. Click to copy code and open shop.
Additional Banggood coupons: first page and second page
There were country-specific coupon codes published on Couponsfromchina social channels and price alerts. Coupon price may vary by country, because there’re different VAT rates, shipping cost etc. There is a chance that some latest coupons are still working:
1. (27.2.2025, $9.26): BGRA384
Item: SONOFF MINI R4 Wifi Switch Module
Countries: Belgium, France, Italy
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
Check out price history chart (for all/most countries) for SONOFF MINI R4 Wifi Switch Module. The lowest price was: $9.19.
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)).