You can create price alert here, copy coupons and view price history. What is best price?
Dimensions 140*83*21mm, Model KW208, Weight 236g, Brand KONNWEI, Support language English / German / Russian /Portuguese / Dutch / Ltalian /French / Spanish, LED screen size 2.0 inch
Aliexpress
There’re some similar (or not) items on Aliexpress
Click here to search by yourself. Here are coupons that you can use.
Latest price update (UTC time):
Banggood
Banggood warehouse is located in China.
Link: Banggood product page
1. ($19.99): BGbceda5
2. ($24.14): BG1efeb0
put item in your cart and apply coupon code there after clicking “Proceed to checkout”. Click to copy code and open shop.
Exclusive Allowance Coupons: https://bit.ly/3xWgD9k and https://couponsfromchina.com/short/5cd
Old coupons (from the oldest to the newest): BGf62b67, BG10OFFAFF1, BGRepair63, ADMITAD2212, 2022ACTIESNL, Tabby20
(probably won’t work, but you can try them out)
Price history and price alert
Here is price history (for all/most countries) for KONNWEI KW208 Car Battery Tester.
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)).