Aliexpress
Click here… to search for RICH BIT TOP-619 36V 250W 10.2Ah Electric Bike [EU] on Aliexpress
Here are coupons that you can use.
Latest coupon code price check (UTC time):
Banggood
Banggood warehouse is located in Europe 
. I don’t know if this is a good price – number of records in my database is too low!
Link: Banggood product page
Coupon (1299.99 USD): BGISSARB
Coupon (1439.99 USD): BG10OFFAFF1
(CouponsFromChina.com tip: coupon code has to be applied in shop’s 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): BGRBT619EU, bGpAnDacHeCk, 7bcdf9, BGSS20SW, BGEBSC15, BGwhielabel
(system checks these coupons on every price check (like once per 24 hours), but you can check them out anyway)
Price history and price alert
There is only one database record (it was for 1299.99 USD), so you can’t see price history chart.
You can set price alert (for Banggood).