Aliexpress
Here are coupons that you can use.
Latest coupon and price update (UTC):
Banggood
Banggood warehouse is located in Europe .
Link: Banggood product page
Coupon (635.99 USD): BG87211b
Coupon (635.99 USD): BG746136
(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): BGX5S59, BGX5SXME, BGEWX5S6Z, BGX5S4S, BGX5S4ZS, BGX5SZ21, BGX5S3Z7, BGX5SZ7
(sometimes old coupons work, so you can check them out (this site checks them on every price update))
Price history and price alert
Here is price history (for all/most countries) for ENGWE X5S 15Ah 48V 350W Electric Bike [EU].
Price records source(s): Gearbest, Banggood
Click on image to enlarge.
You can set price alert (for Banggood).