$39.99 – Hugen Version 2.8 Inch NanoVNA-H Vector Network Antenna Analyzer 10KHz-1.5GHz (Banggood, Aliexpress: Original Hugen Version 2.8 Inch NanoVNA-H Vector Network Antenna Analyzer 10KHz-1.5GHz MF HF VHF UHF With SD Card Slot V3.6 Version spectrum analyzer (the best price with coupon)).
I have just checked coupons. The lowest price I could get is $39.99 for Hugen Version 2.8 Inch NanoVNA-H Vector Network Antenna Analyzer 10KHz-1.5GHz (in Banggood). You can create price alert here, copy coupons and view price history. Best price?
Latest price update (UTC time):
Banggood ($39.99)
Banggood warehouse is located in China. I’m afraid that there’s no working coupon in Banggood. But wait a sec… Is it a good price? Hmmm, price is higher than average (which is $36.24 right now), so better set price alert down below…
Link: Banggood product page
Price: $39.99
Exclusive Allowance Coupons: https://bit.ly/3xWgD9k and https://couponsfromchina.com/short/5cd
Old coupons (from the oldest to the newest): BGb8b827, BGTOOS729, BG8FORMULAMX
(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
Do you need price history chart (for all/most countries) for Hugen Version 2.8 Inch NanoVNA-H Vector Network Antenna Analyzer 10KHz-1.5GHz? There we go. The lowest price was: $35.99.
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)).