According to my DB the lowest price is $59.99 for NOYAFA NF-308S Network Cable Tester (in Banggood). Go down and check coupons out. Remember to check price history if it is available. What is the best price?
Latest price update (UTC time):
NOYAFA NF-308S Network Cable Tester Measure Length Wiremap Tester LCD Display Cable Tracker RJ45 RJ11 Network Tester Tools
Banggood ($59.99)
Banggood warehouse is located in China. There is no active coupon in my database right now (for Banggood). Low/high price? Hmmm, price is higher than average (which is $42.49 right now), so better set price alert down below…
Link: Banggood product page
Price: $59.99
Exclusive Allowance Coupons: https://bit.ly/3xWgD9k and https://couponsfromchina.com/short/5cd
Old coupons (from the oldest to the newest): BGTOOS729
(there’s a little possibility that old coupon will work)
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
Check out price history chart (for all/most countries) for NOYAFA NF-308S Network Cable 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)).