Operating Humidity: 5%-90%RH / Non-condensing, Enclosure Material: Fire Retardant ABS, Certification: CE / FCC, Product Dimensions: 104*55*73(mm), Max. Current: 10A, Power supply: 90V~250V AC(50/60Hz), Encryption: WEP/TKIP/AES, Security Mechanism: WPA-PSK/WPA2-PSK, Wireless standard: 802.11.b/g/n 2.4G WiFi, Operating Temperature: 0ºC-40ºC(32°F-104°F), Max power: 2200W, Standard: FR Plug.
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.
Updated:
Banggood
Warehouse in China.
Link: 5x SONOFF S26 10A AC90V-250V Smart WIFI Socket FR
$63.75 with coupon: BG8OFFCOUPON
$63.75 with coupon: TTBLACK5
Additional Banggood coupons:
1. First page
2. Second page
Other warehouses/versions
This item is available in 1 another warehouse/version!
1. Europe – 5x SONOFF S26 10A AC90V-250V Smart WIFI Socket FR [EU] ($-3)
Price history and price alert
Price history (for all/most countries) for 5x SONOFF S26 10A AC90V-250V Smart WIFI Socket FR is here. The lowest price was: $63.05.
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)).
.