Aliexpress
Click here… to search for FIIDO D1 36V 250W 11.6Ah Electric Bicycle [EU] on Aliexpress
Here are coupons that you can use.
Latest coupon and price update (UTC):
Banggood
Banggood warehouse is located in Europe 
. Sorry, but there’s no price history in my database. One coupon is available. Cool!
Link: Banggood product page
Coupon (539.99 USD): BGFDD1TEU
(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): 7bcdf9
(sometimes old coupons work, so you can check them out (this site checks them on every price update))
Price history and price alert
It’s a new item in our database, so I can’t create price history chart. We have saved this price in database: 539.99 USD.
You can set price alert (for Banggood).