Aliexpress
Here are coupons that you can use.
Latest coupon and price update (UTC):
Banggood
Banggood warehouse is located in China. There is one great coupon!
Link: Banggood product page
Coupon (36.95 USD): BGSCM75
(CouponsFromChina.com tip: apply code in your basket (cart) after clicking “Proceed to checkout”. Click to copy code and open shop)
Exclusive Allowance Coupons: https://bit.ly/3xWgD9k
Old coupons (from the oldest to the newest): BG77cc5d, BG888b71
(there’s a little possibility that old coupon will work)
Price history and price alert
Do you need price history chart (for all/most countries) for KONNWEI KW320 Obd 2 Car Diagnostic Tool? There we go.
Price records source(s): Banggood
Click on image to enlarge. 
You can set price alert (for Banggood).