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 (1539.99 USD): BGXT750P12
Coupon (1649.99 USD): 7bcdf9
(CouponsFromChina.com tip: put item in your cart and apply coupon code there 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): BGwhielabel, BGEBSC15
(these coupons are old, so probably won’t work)
Price history and price alert
Do you need price history chart (for all/most countries) for LANKELEISI XT750PLUS 12.8Ah 48V 500W 26Inch Electric Bike? There we go.
Price records source(s): Banggood
Click on image to enlarge. 
You can set price alert (for Banggood).