Price history, coupons and price alert are available on this page. You probably want to know what is the best price?
sonic vibrating 42000 strokes per minute, 280gf.cm strong torque output, strong torque output, DuPont Tynex Brilliance bristle, improved with German Pedex brush, 3 Cleaning Modesx 4-grade Cleanness, Charging in 3.5 Hours for Full, IPX7 Waterproof Rating, Battery capacity: 2600mAh
Aliexpress
There’re some similar (or not) items 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. ($67.49): BGHONEY2110
2. ($67.49): BG10OFFAFF
3. ($73.99): 13f142
apply it in your cart after clicking “Proceed to checkout”. Click to copy code and open shop.
Exclusive Allowance Coupons: https://bit.ly/3xWgD9k and https://couponsfromchina.com/short/5cd
Old coupons (from the oldest to the newest): BGONE99, dddf57, 502C6B, vipupgrade8, bGhOnEy10, BGTMCB7, bgshOOp10, BGHB20, BgoFErTaSchInA10, BGSD58965, BgcLuBofErtA10, 7d18f7, BGHBHJ107, BGAFF10OFF, BGCuponation10
(these codes were not working in latest coupon update, but you can check them out anyway)
Other warehouses/versions
This item is available in 2 another warehouse/versions!
1. China – Xiaomi Oclean One Sonic Toothbrush ($-3)
2. China – Xiaomi Oclean One Sonic Toothbrush Pink ($-3)
Price history and price alert
Here is price history (for all/most countries) for Xiaomi Oclean One Sonic Toothbrush Black.
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)).