I have just checked coupons. The lowest price I could get is $42.39 for 10KHz-1.5GHz MF HF VHF UHF Digital NanoVNA-H Vector Antenna Analyzer (in Banggood). Just check coupons out (with price alert and history). Let’s see what best price is ATM.
Latest coupon code price check (UTC time):
10KHz-1.5GHz MF HF VHF UHF Digital NanoVNA-H Vector Network Antenna Analyzer Support 32G SD Card
Banggood ($42.39)
Banggood warehouse is located in China. CouponsFromChina software could not find any coupon for this product in Banggood. Is it cheap? This price is higher than average price ($37.56) for this item.
Link: Banggood product page
Price: $42.39
Exclusive Allowance Coupons: https://bit.ly/3xWgD9k and https://couponsfromchina.com/short/5cd
Old coupons (from the oldest to the newest): BG6b400f, BGM1TOOLS88, BG53ef2b, BG20236Tool, BGTOOS729
(these coupons are old, so probably won’t 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
Price history (for all/most countries) for 10KHz-1.5GHz MF HF VHF UHF Digital NanoVNA-H Vector Antenna Analyzer is here.
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)).