$10.99 – SONOFF MINI R4 Wifi Switch Module (Banggood, Aliexpress: SONOFF MINI R4 Wifi Switch Module Smart Wi-Fi Two Way Switch Smart Home Works R5 S-MATE Wireless Control Alexa Google Home (the best price with coupon)).
I am monitoring price for SONOFF MINI R4 Wifi Switch Module and it is for $10.99 now (in Banggood). Basically copy coupon, view price history or create e-mail price alert. What is the best price?
Latest coupon code price check (UTC time):
Banggood ($10.99)
Banggood warehouse is located in China. I’m afraid that there’s no working coupon in Banggood. You probably want to know if this is a good price. From what I can see this price is higher than average price ($10.09).
Link: Banggood product page
Price: $10.99
Exclusive Allowance Coupons: https://bit.ly/3xWgD9k and https://couponsfromchina.com/short/feV
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 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)).