5 pcs. SONOFF Basic 10A 2200W WIFI Smart Switch [EU] (Banggood, Aliexpress: Humidity: 5%-90%RH / Non-condensing, Weight: 51.0g, Max current: 10A, Color: White, Security Mechanism: WPA-PSK/WPA2-PSK, Enclosure Material: Fire-retardant ABS V0, Wireless Standard: 802.11 b/g/n, Operating Temperature: 0ºC-40ºC(32°F-104°F), Dimensions: 88*38*23mm (L*W*H), Gang: 1, Voltage range: 90-250v AC(50/60Hz), Max Wattage: 2200W (the best price with coupon)).
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Aliexpress
There’re some similar (or not) items on Aliexpress
Click here to search by yourself. Here are coupons that you can use.
Latest price update (UTC time):
Banggood
Banggood warehouse is located in Europe 
. I can’t tell you if this price is good – not enough records in my database, so I won’t judge.
Link: Banggood product page
1. ($31.98): BGGutscheine
2. ($32.33): BG8ReviTrage
3. ($32.33): BGcoupon8off
just apply this code in your cart after clicking “Proceed to checkout”. Click to copy code and open shop.
Exclusive Allowance Coupons: https://bit.ly/3xWgD9k and https://couponsfromchina.com/short/5cd
Old coupons (from the oldest to the newest): BG126161, BGSTHO15, BGHONEY2110, BGSHOM15, 13f142, 6GSGIT, BGSmart6, MVC8SPRING, 8BGwbg2204, tRaDetRaCKeR, 8wEbgaInS5, BG15Sonoff, Cuponation9
(sometimes old coupons work, so you can check them out (this site checks them on every price update))
Price history and price alert
It doesn’t make sense to generate price history chart, because there is one price record which is: $20.42.
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)).