Product: Wireless Handheld Electric Cleaner, Waterproof Rate: IPX7, Battery: 3.6V, Color: White+Black, Material: PP+TPE, Working Time: 1-2hours, Charging Time: 13hours, 2.1mA Nimh battery, Rotating speed: 180-220RPM.
You can create price alert here, copy coupons and view price history. Do you want to know what the best price is?
Aliexpress
I could not find it on Aliexpress. Click here to search by yourself.
Here are coupons that you can use.
Latest coupon code price check (UTC time):
Banggood
Banggood warehouse is located in China.
Link: Banggood product page
1. ($50.07): bGhOnEy10
2. ($50.07): bgshOOp10
3. ($50.07): BgcLuBofErtA10
this code has to be applied in your cart after clicking “Proceed to checkout”. Click to copy code and open shop.
Additional Banggood coupons: first page and second page
Old coupons (from the oldest to the newest): b71c67, BgAuMotor, AM15prime, AMPrime01, Automo, Automo1, BGAutos
(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 SHUNZAO Electric Cleaner Brush. The lowest price was: $39.99.
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)).