Aliexpress
Here are coupons that you can use.
Latest price update (UTC time):
Banggood
Banggood warehouse is located in China. I don’t think there is an active coupon right now – at least in my database.
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): BG7d7385, BGRepair63, BG00c906, 2022ACTIESNL, BG7b6dfe, Terence, BG1efeb0, MVC8SPRING, 8BGwbg2204, 2203ActiesNL
(there’s a little possibility that old coupon will work)
Price history and price alert
Check out price history chart (for all/most countries) for Launch X431 V+ V4.0 10.1 Inch Car Diagnostic Scan Tool.
Price records source(s): Banggood
Click on image to enlarge. 
You can set price alert (for Banggood).