Aliexpress
Click here… to search for AOSTIRMOTOR S05-1 500W 48V 15Ah Electric Bicycle [EU] on Aliexpress
Here are coupons that you can use.
Latest coupon code price check (UTC time):
Banggood
Banggood warehouse is located in Europe 
. Too bad there’s no coupon right now in Banggood. There’s only 1 record in my database, so I have no idea if the price is OK.
Link: Banggood product page
Price: -3 USD
It looks like this item is out of stock in Banggood. If you found it then please send me the link. I will replace it.
Click here to search on Banggood!
Exclusive Allowance Coupons: https://bit.ly/3xWgD9k
Old coupons (from the oldest to the newest): BGe1965e, BG1564e6, BG45b9e1, BGfca91f, BGb96802, BG06c1f0, BG7b32d3, BGcdca26, BG47649e
(you can check these old coupons out, but these probably won’t work)
Price history and price alert
Price history is not available for this item (not enough database records)! The lowest price was 1859.99 USD though.
You can set price alert (for Banggood).