Xiaomi Mijia Wifi Remote Controller Switch (Banggood, Aliexpress: Power input 5V—1A, Infrared frequency 38kHz, Color Black, Wireless connection Wi-Fi IEEE 802.11 b/g/n 2.4GHz, Working temperature -10 ° C ~ 50 ° C, Net weight 133g, Product size 100x 100x 26mm, Product material PC (the best price with coupon)).
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Aliexpress
There’re some similar (or not) items on Aliexpress
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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.
Link: Banggood product page
1. ($17.99): bGhOnEy10
2. ($17.99): BGSS10%SW
3. ($18.99): 13f142
apply it 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/feV
Old coupons (from the oldest to the newest): 502C6B, 6C8E66, 6c9903, bgmh2, BGMIB2, BGOMG2, TS15prime, TISPrime01, BG14XM, PICODICOM, BGXMSSR, BGBFAFF2019, BGCITYADS2019, BGMRC, BGRCRA, BGMHPK, bGpAnDacHeCk, BGOMG4, BGRCSRA, BGHOMEAPP, bgshOOp10, BGHome15%, BGHOMEAPP13
(sometimes old coupons work, so you can check them out (this site checks them on every price update))
Price history and price alert
Here is price history (for all/most countries) for Xiaomi Mijia Wifi Remote Controller Switch. The lowest price was: $13.59.
Price records source(s): Gearbest, 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)).