Just check coupons out (with price alert and history). Best price?
Accuracy: R: 0.5% V: 0.5%, Signal Source: AC: 1kHz At 20mΩ range: 50mA At 200mΩ / 2Ω range: 5mA At 20Ω / 200Ω range: 0.5mA, Speed: 10 times/second, Measurement Range: R: 0.01mΩ ~ 200Ω V: 0.001 V ~ ±75VDCV, Range: R: Automatic and Manual. 5 ranges /V: Automatic and Manual / 3 ranges, Parameters: AC resistance / DC voltage
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. We have found one coupon for this product!
Link: Banggood product page
1. ($50.99): BG20236Tool
this code has to be applied in your cart 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): BGTR752, BGGines
(you can check these old coupons out, but these probably won’t work)
Price history and price alert
Here is price history (for all/most countries) for RC3563 Battery Internal Resistance 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)).