Aliexpress
Here are coupons that you can use.
Other warehouses/versions
This item is available in 1 another warehouse/version!
1. Europe – 5x SONOFF S26 10A AC90V-250V Smart WIFI Socket FR [EU] (-3 USD)
Latest coupon and price update (UTC):
Banggood
Banggood warehouse is located in China.
Link: Banggood product page
Coupon (63.75 USD): BG8OFFCOUPON
Coupon (63.75 USD): TTBLACK5
(CouponsFromChina.com tip: coupon code has to be applied in shop’s 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): BGSmart6, MVC8SPRING, 8BGwbg2204, 2203ActiesNL, tRaDetRaCKeR, 8wEbgaInS5, pROMo8cuPoN, hoNEYbGdeAlS, Cuponation9, COUPONSDE1wk, BG8ReviTrage, BGcoupon8off, BGGutscheine
(these coupons are old, so probably won’t work)
Other warehouses/versions
This item is available in 1 another warehouse/version!
1. Europe – 5x SONOFF S26 10A AC90V-250V Smart WIFI Socket FR [EU] (-3 USD)
Price history and price alert
Here is price history (for all/most countries) for 5x SONOFF S26 10A AC90V-250V Smart WIFI Socket FR.
Price records source(s): Banggood
Click on image to enlarge. 
You can set price alert (for Banggood).