Aliexpress
Click here… to search for Ninebot E22 300W 36V 5.2Ah Electric Scooter on Aliexpress
Here are coupons that you can use.
Latest coupon and price update (UTC):
Banggood
Banggood warehouse is located in China.
Link: Banggood product page
Coupon (539.55 USD): BGEBSC15
Coupon (564.99 USD): 7bcdf9
(CouponsFromChina.com tip: apply code in your basket (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): bGpAnDacHeCk, BGAFF7OFF
(you can check these old coupons out, but these probably won’t work)
Price history and price alert
Check out price history chart (for all/most countries) for Ninebot E22 300W 36V 5.2Ah Electric Scooter.
Price records source(s): Banggood
Click on image to enlarge. 
You can set price alert (for Banggood).