Aliexpress
Here are coupons that you can use.
Latest coupon code price check (UTC time):
Banggood
Banggood warehouse is located in China. I found coupon for you. Check this out.
Link: Banggood product page
Coupon (21.11 USD): BGSCM11
(CouponsFromChina.com tip: you should apply the coupon in your 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): BG9FEB2023B, BGCRT313, BGCAR639
(these coupons are old, so probably won’t work)
Price history and price alert
Price history (for all/most countries) for EM285 6-24V DC Automotive Electric Circuit Tester is here.
Price records source(s): Banggood
Click on image to enlarge. 
You can set price alert (for Banggood).