I am monitoring price for 71W 42V 1.7A Charger for ES1 ES2 ES4 M365 Pro 1S Electric Scooter and it is for $33.99 now (in Banggood). You can create price alert here, copy coupons and view price history. Do you want to know what the best price is?
Gross Weight 434g, Package Size 168*118*48mm, Color Black, Product Battery Charger, Plug EU Plug / US Plug, Suitable for E-Scooter for Ninebot ES1 ES2 ES4 / For Xiaomi M365 Pro 1S, Input voltage 100-240V, Output voltage 71W 42V 1.7A
Latest coupon and price update (UTC):
Banggood ($33.99)
Banggood warehouse is located in China. I’m afraid that there’s no working coupon in Banggood. Isn’t it too expensive? Hmmm, price is higher than average (which is $22.81 right now), so better set price alert down below…
Link: Banggood product page
Price: $33.99
Exclusive Allowance Coupons: https://bit.ly/3xWgD9k and https://couponsfromchina.com/short/5cd
Old coupons (from the oldest to the newest): cad89c, BGc8e14f, BG53ded1, BG589b2e
(you can check these old coupons out, but these probably won’t work)
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
Price history (for all/most countries) for 71W 42V 1.7A Charger for ES1 ES2 ES4 M365 Pro 1S Electric Scooter is here.
Price records source(s): Banggood
Click on image to enlarge. 
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)).