Max Payload: 85kg, Maximum Speed (km/h): 16km/h, Rated Power: 700W, Tire Diameter: 10.5 inches, Mileage (depends on road and driver weight): Above 20km.
Go down and check coupons out. Remember to check price history if it is available. You probably want to know what is the best price?
Aliexpress
I could not find it on Aliexpress. 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. ($399.99): BGXMSB7CN
2. ($490.99): 7bcdf9
put item in your cart and apply coupon code there after clicking “Proceed to checkout”. Click to copy code and open shop.
Additional Banggood coupons: first page and second page
Old coupons (from the oldest to the newest): 9fec15, e2bcea, 502C6B, PICODICOM, picodicom, 5d1752, bGpAnDacHeCk
(system checks these coupons on every price check (like once per 24 hours), but you can check them out anyway)
Other warehouses/versions
This item is available in 1 another warehouse/version!
1. China – Xiaomi Ninebot Mini 700W Balance Electric Scooter White ($-3)
Price history and price alert
Check out price history chart (for all/most countries) for Xiaomi Ninebot Mini 700W Balance Electric Scooter Black. The lowest price was: $382.49.
Price records source(s): 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)).