Aliexpress
Here are coupons that you can use.
Latest price update (UTC time):
Banggood
Banggood warehouse is located in China. I couldn’t find any coupon for this product on latest product update.
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): BGwhielabel, CMSCN21, 7bcdf9
(there’s a little possibility that old coupon will work)
Price history and price alert
Here is price history (for all/most countries) for CMSBIKE F16PLUS 250W 13Ah 16 Inches Electric Bike.
Price records source(s): Banggood
Click on image to enlarge. 
You can set price alert (for Banggood).