Aliexpress
Click here… to search for Xiaomi Qingmi WiFi Smart Power Strip 3 Sockets on Aliexpress
Here are coupons that you can use.
Latest price update (UTC time):
Banggood
Banggood warehouse is located in China.
Link: Banggood product page
Coupon (29.15 USD): BGSAMRTH
Coupon (29.39 USD): BGSMOFF
(CouponsFromChina.com tip: apply it in your 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): 502C6B, affiliate6, 2019SPEDM, bgssaff9, aff7off, BGaDmITAd, BGBFAFF2019, BGCITYADS2019, BGAQ20, BGSAMH, bGhOnEy10, BGSM15, bgshOOp10
(there’s a little possibility that old coupon will work)
Price history and price alert
Price history (for all/most countries) for Xiaomi Qingmi WiFi Smart Power Strip 3 Sockets is here.
Price records source(s): Banggood
Click on image to enlarge. 
You can set price alert (for Banggood).