Enclosure Material: PC V0 + toughened glass panel, Output: 1C: AC 100-240V 50/60Hz 2A Max, 3C: 60W/110V(per channel), 2C: AC 100-240V 50/60Hz 4A Max, 300W/220V(per channel), 2C: AC 100-240V 50/60Hz 2A/Gand 4A/Total, 3C: AC 100-240V 50/60Hz 1A/Gang 3A/Total, LED load: 1C/2C: 150W/110V(per channel), 3C: AC 100-240V 50/60Hz 3A Max, Color: Black, US Size: 120*74*38mm, RF: 433.92MHz, Operating systems: Android_4.1 or higher&iOS 9.0 or higher, Input: 1C: AC 100-240V 50/60Hz 2A Max, Gang: 1 gang/2 gang/3 gang, Standard: US/UK/EU, EU/UK Size: 86*86*35mm, 100W/220V(per channel), Wireless Standard: IEEE 802.11 b/g/n 2.4G.
Go down and check coupons out. Remember to check price history if it is available. Best price?
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 coupon and price update (UTC):
Banggood
Banggood warehouse is located in China. I don’t think there is an active coupon right now – at least in my database.
Link: Banggood product page
Price: $-3
It looks like this item is out of stock in Banggood. If you found it then please send me the link. I will replace it.
Click here to search on Banggood!
Additional Banggood coupons: first page and second page
There were country-specific coupon codes published on Couponsfromchina social channels and price alerts. Coupon price may vary by country, because there’re different VAT rates, shipping cost etc. There is a chance that some latest coupons are still working:
Old coupons (from the oldest to the newest): elec, BGST3, BG15T23, SONOFF15, bGpAnDacHeCk, 2020CNY, BGVDay10%off, BG8SFF, BGTT10, bGhOnEy10, BGSMOFF, BGSONOFFT3, 13f142, BGSONOFF15, BGELIG0920, BgcLuBofErtA10, BGSONOFF16, BGAFF10OFF, BGSTHO15, BG11513, BGCuponation10, BGHONEY2110, BGSHOM15, BGSHE15, BG1b28f9, BG1470799, 6GSGIT, BG737f3f, BGKUBA1QBAF, BG2eea5b, ADMITAD2212, BGSmart6, 8BGwbg2204, tRaDetRaCKeR, 8wEbgaInS5, pROMo8cuPoN, BGJUNEGSG9, BG15Sonoff, BG8ReviTrage, Cuponation9, 9OFFSUMMER, BG24ffd1, BGfe2626, BG775820, BGb5f913
(probably won’t work, but you can try them out)
Other warehouses/versions
This item is available in 4 another warehouse/versions!
1. China – SONOFF T3 2 Gangs TX WIFI Wall Switch ($-3)
2. China – SONOFF T3 3 Gangs TX WIFI Wall Switch ($-3)
3. Europe – SONOFF T3 2 Gangs TX WIFI Wall Switch [EU] ($-3)
4. Europe – SONOFF T3 1 Gang TX WIFI Wall Switch [EU] ($-3)
Price history and price alert
Check out price history chart (for all/most countries) for SONOFF T3 1 Gang TX WIFI Wall Switch. The lowest price was: $11.89.
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)).