You can get CSC SW900 36V 350W Electric Bike Conversion Kit [EU] for $256.99 with coupon (from Banggood). It is from European warehouse! You can create price alert here, copy coupons and view price history. What is the best price?
[EU Direct] CSC SW900 36V 350W eBike Conversion Kit Electric Bicycle Engine MTB Brushless Hub Motor Bike Wheel Kit 26/27.5/29inch/700C – Front Wheel 700C
Latest price update (UTC time):
Banggood ($256.99)
Banggood warehouse is located in Europe 
. CouponsFromChina software could not find any coupon for this product in Banggood. What about the price? I don’t know if this is a good price – number of records in my database is too low!
Link: Banggood product page
Price: $256.99
Exclusive Allowance Coupons: https://bit.ly/3xWgD9k and https://couponsfromchina.com/short/5cd
Aliexpress
There’re some similar (or not) items on Aliexpress
Click here to search by yourself. Here are coupons that you can use.
Price history and price alert
There is only one database record (it was for $242.99), so you can’t see price history chart.
You can set price alert (for Banggood and Aliexpress (only if product name will be the same as on Banggood and I will post it on social media though, so it’s more like Banggood price alert)).