Aliexpress
Here are coupons that you can use.
Other warehouses/versions
This item is available in 1 another warehouse/version!
1. China – SONOFF RF Remote Controller 86 Type 1 Gang (-3 USD)
Latest coupon code price check (UTC time):
Banggood
Banggood warehouse is located in Europe 
. Hmmm… There is no active coupon in Banggood at this moment. This is new product in my database, so I don’t know if this price is good.
Link: Banggood product page
Price: -3 USD
It looks like this item is out of stock in Banggood. If you found it then please send me the link. I will replace it.
Click here to search on Banggood!
Exclusive Allowance Coupons: https://bit.ly/3xWgD9k
Old coupons (from the oldest to the newest): 6GSGIT, ADMITAD2212, BGSmart6, BG2a7b75, 2022ACTIESNL, 8Couponsde, MVC8SPRING, 2203ActiesNL, BGJUNEGSG9, BG15Sonoff, TTSUMMER8, Cuponation9, 9OFFSUMMER
(sometimes old coupons work, so you can check them out (this site checks them on every price update))
Other warehouses/versions
This item is available in 1 another warehouse/version!
1. China – SONOFF RF Remote Controller 86 Type 1 Gang (-3 USD)
Price history and price alert
There is only one database record (it was for 6.99 USD), so you can’t see price history chart.
You can set price alert (for Banggood).