I have just checked coupons. The lowest price I could get is $7.99 for ANENG BT-171 Battery Tester 12V (in Banggood). Go down and check coupons out. Remember to check price history if it is available. Best price?
ANENG BT-171 Battery Tester 12V LCD Digital Auto Battery Analyzer Charging Cranking System Tester Car Battery Checker Diagnostic Tool
Latest coupon code price check (UTC time):
Banggood ($7.99)
Banggood warehouse is located in China. Coupons for ANENG BT-171 Battery Tester 12V? Nope, there’re no coupons in Banggood. Is it good price? Hmmm, price is higher than average (which is $7.74 right now), so better set price alert down below…
Link: Banggood product page
Price: $7.99
Exclusive Allowance Coupons: https://bit.ly/3xWgD9k and https://couponsfromchina.com/short/5cd
Old coupons (from the oldest to the newest): BGM1TOOLS88
(I don’t think these’re gonna work, but you can try ’em out anyway)
Aliexpress
There’re some similar (or not) items on Aliexpress
Click here to search by yourself. Here are coupons that you can use.
Price history and price alert
Do you need price history chart (for all/most countries) for ANENG BT-171 Battery Tester 12V? There we go.
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)).