Aliexpress
Click here… to search for SONOFF 4CH Pro R2 Module on Aliexpress
Here are coupons that you can use.
Other warehouses/versions
This item is available in 1 another warehouse/version!
1. Europe – SONOFF 4CH Pro R2 Module [EU] (-3 USD)
Latest coupon code price check (UTC time):
Banggood
Banggood warehouse is located in China. You can get coupon down below.
Link: Banggood product page
Coupon (25.61 USD): BGSONOFF15
(CouponsFromChina.com tip: 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
Old coupons (from the oldest to the newest): elec, 166253, SONOFF15, BGE13, bGpAnDacHeCk, 0e7f33, FBCOUPON1, bGhOnEy10, BGSMOFF, BGSONOFF16, BGAFF10OFF, BGHONEY2110, BGSHOM15, BG15Sonoff
(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. Europe – SONOFF 4CH Pro R2 Module [EU] (-3 USD)
Price history and price alert
Price history (for all/most countries) for SONOFF 4CH Pro R2 Module is here.
Price records source(s): Gearbest, Banggood
Click on image to enlarge. 
You can set price alert (for Banggood).