Aliexpress
Here are coupons that you can use.
Other warehouses/versions
This item is available in 3 another warehouse/versions!
1. China – SONOFF T1 1CH Wifi Smart Switch (-3 USD)
2. China – SONOFF T1 2CH Wifi Smart Switch (-3 USD)
3. Europe – SONOFF T1 2CH Wifi Smart Switch [EU] (-3 USD)
Latest coupon code price check (UTC time):
Banggood
Banggood warehouse is located in China. There is one coupon available! Pretty cool, huh?
Link: Banggood product page
Coupon (23.08 USD): MVC8SPRING
(CouponsFromChina.com tip: paste coupon code in your cart and click Apply after clicking “Proceed to checkout”. Click to copy code and open shop)
Exclusive Allowance Coupons: https://bit.ly/3xWgD9k
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): e2bcea, 502C6B, 847fc3, elec, BGMINIT1, bGhOnEy10, BGSMOFF, BGSONOFFT1, 13f142, BGSONOFF15, BGELIG0920, BgcLuBofErtA10, BGSONOFF16, BGAFF10OFF, BGSTHO15, BGCuponation10, BGHONEY2110, BGSHOM15, BGSHE15, 6GSGIT, BGf2b910, ADMITAD2212, BGSmart6, BG15Sonoff, Cuponation9, BG8ReviTrage, BG597de7, BG12MAY2023F, BGdd54b4
(there’s a little possibility that old coupon will work)
Other warehouses/versions
This item is available in 3 another warehouse/versions!
1. China – SONOFF T1 1CH Wifi Smart Switch (-3 USD)
2. China – SONOFF T1 2CH Wifi Smart Switch (-3 USD)
3. Europe – SONOFF T1 2CH Wifi Smart Switch [EU] (-3 USD)
Price history and price alert
Here is price history (for all/most countries) for SONOFF T1 3CH Wifi Smart Switch.
Price records source(s): Gearbest, Banggood
Click on image to enlarge. 
You can set price alert (for Banggood).