You can create price alert here, copy coupons and view price history. Best price?
Brand KONNWEI, Screen 2.4″ Color TFT, Voltage DC 9-16V, CCA 100-2000, AH 30-220, Software Version V1.01 / Update Free Online, Special Features Wire Connection, Item Size 16.5cmx 6cmx 2.5cm, Working Temperature -20 to 70 ℃, Model KW600, Weight 450g, CPU Chip STM32
Aliexpress
There’re some similar (or not) items on Aliexpress
Click here to search by yourself. Here are coupons that you can use.
Latest coupon and price update (UTC):
Banggood
Banggood warehouse is located in China. I am tired of searching coupons, but I found one for you…
Link: Banggood product page
1. ($43.99): BGSCM75
paste coupon code in your cart and click Apply after clicking “Proceed to checkout”. Click to copy code and open shop)
Exclusive Allowance Coupons: https://bit.ly/3xWgD9k and https://couponsfromchina.com/short/5cd
Old coupons (from the oldest to the newest): BG3499kw, BGAutos, BGCARELEC, BGH8165401, BGAFF10OFF, BGSABAUM26, BGHLim541, BG10OFFAFF, BGwhielabel, BGHRepair2, BG10OFFAFF1, BG12513f, BGRepair63, BG7d83b9, ADMITAD2212, 2022ACTIESNL, Tabby20, 2203ActiesNL, BG1efeb0, MVC8SPRING, BGdcbfa8
(probably won’t work, but you can try them out)
Other warehouses/versions
This item is available in 1 another warehouse/version!
1. Europe – KONNWEI KW600 Professional Car Digital Battery Tester [EU] ($-3)
Price history and price alert
Check out price history chart (for all/most countries) for KONNWEI KW600 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)).