SONOFF 4CH Rev2 Smart Switch (Banggood, Aliexpress: Max. power: 2200W / gang, 3500W / total, Max. current: 10A / gang, Power supply: 90 – 264V AC (50 / 60Hz) (the best price with coupon)).
Basically copy coupon, view price history or create e-mail price alert. Let’s see what best price is ATM.
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.
Latest price update (UTC time):
Banggood
Banggood warehouse is located in China.
Link: Banggood product page
1. ($17.49): BgcLuBofErtA10
2. ($18.43): 13f142
just apply this code in your cart after clicking “Proceed to checkout”. Click to copy code and open shop.
Exclusive Allowance Coupons: https://bit.ly/3xWgD9k and https://couponsfromchina.com/short/i1u
Old coupons (from the oldest to the newest): 502C6B, elec, BG4CHR2, BGCITYADS2019, BGE13, bGpAnDacHeCk, BGVDay10%off, 0e7f33, FBCOUPON1, bGhOnEy10, BGTT10, BGSMOFF, BGSONOFF15, BGELIG0920, BGSONOFF16, BGSHOM15, BG15Sonoff
(system checks these coupons on every price check (like once per 24 hours), but you can check them out anyway)
Other warehouses/versions
This item is available in 1 another warehouse/version!
1. Europe – SONOFF 4CH Rev2 Smart Switch [EU/UK] ($-3)
Price history and price alert
Do you need price history chart (for all/most countries) for SONOFF 4CH Rev2 Smart Switch? There we go. The lowest price was: $12.74.
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)).