Latest update shows that NanoVNA-F V3 4.3 inch LCD 1M-6GHz Vector Network Analyzer costs $209.99 (in Banggood). Check coupons or create price alert down below. You probably want to know what is the best price?
NanoVNA-F V3 4.3 inch LCD 1M-6GHz Vector Network Analyzer, Shortwave Analyzer MF HF VHF UHF Talent Nanovna-F Antenna Analyzer
Latest coupon and price update (UTC):
Banggood ($209.99)
Banggood warehouse is located in China. I’m afraid that there’s no working coupon in Banggood. Is it a reasonable price for this item? It’s a good price, isn’t it? The average is $221.13.
Link: Banggood product page
Price: $209.99
Exclusive Allowance Coupons: https://bit.ly/3xWgD9k and https://couponsfromchina.com/short/5cd
Old coupons (from the oldest to the newest): BG624641, BG4b3a27
(you can check these old coupons out, but these 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 NanoVNA-F V3 4.3 inch LCD 1M-6GHz Vector Network 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)).