Material: PC V0, Input: AC100-240V 50/60Hz 10A Max, Model: MINI, WIFI: IEEE 802.11 b/g/n 2.4GHz, Output: AC100-240V 50/60Hz 10A Max, Size: 42.6×42.6x20mm.
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Aliexpress
There’re some similar (or not) items on Aliexpress
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Click here to search by yourself. Here are coupons that you can use.
Latest coupon and price update (UTC):
Banggood
Banggood warehouse is located in China. You can get coupon down below.
Link: Banggood product page
1. ($40.24): BGSmart6
apply code in your basket (cart) after clicking “Proceed to checkout”. Click to copy code and open shop.
Additional Banggood coupons: first page and second page
Old coupons (from the oldest to the newest): elec, BGE13, BGVDay10%off, bGhOnEy10, BGSMOFF, bgshOOp10, BGSAMRTH, BGELIG0920, BgcLuBofErtA10, BGSONOFF16, BGAFF10OFF, BGSTHO15, BGCuponation10, 13f142, BGHONEY2110, BGSHOM15, BGSHE15, BG34cd45, 6GSGIT, ADMITAD2212, BGc5d108, 8BGwbg2204, 2203ActiesNL, tRaDetRaCKeR, 8wEbgaInS5, pROMo8cuPoN, BG15Sonoff
(system checks these coupons on every price check (like once per 24 hours), but you can check them out anyway)
Other warehouses/versions
This item is available in 1 another warehouse/version!
1. Europe – 5Pcs SONOFF Two Way Smart Switch 10A [EU] ($-3)
Price history and price alert
Here is price history (for all/most countries) for 5Pcs SONOFF Two Way Smart Switch 10A. The lowest price was: $27.9.
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)).