I have checked all old coupons and price is 11.99 USD for With Horn for ES10 (in Banggood). Just check coupons out (with price alert and history). What is the best price?
Latest price update (UTC time):
Banggood (11.99 USD)
Banggood warehouse is located in China. I’m afraid that there’s no working coupon in Banggood. I think you want to know if the price is good. From what I can see this price is higher than average price (9.39 USD).
Link: Banggood product page
Price: 11.99 USD
Exclusive Allowance Coupons: https://bit.ly/3xWgD9k
Old coupons (from the oldest to the newest): BGe58246, BG8bd7c9, BGa60e1c, BGc8e14f, BG589b2e
(these codes were not working in latest coupon update, but you can check them out anyway)
Aliexpress
Click here… to search for LAOTIE 36V-72V Front Electric Scooter Light With Horn for ES10 ES10P ES18 Lite L8S Pro on Aliexpress
Here are coupons that you can use.
Price history and price alert
Here is price history (for all/most countries) for LAOTIE 36V-72V Front Electric Scooter Light With Horn for ES10 ES10P ES18 Lite L8S Pro.
Price records source(s): Banggood
Click on image to enlarge. 
You can set price alert (for Banggood).