I would also like to get a VNA, and there's lots of clones, of all prices. I found the Tindie store and see the $300 NanoVNA V2 Plus4, it says it's good up to 4.4GHz. The original was closer to 900MHz or 1.6GHz.
I have FFT on my scope, so I'm not in a rush to get something like a Siglent spectrum analyzer SSA3021X plus, that can be upgraded or hacked to include the VNA functions, if I read that right. But then again I was going to upgrade my sds1204X-E scope, for about the same price. I don't really have to do that, but I don't really really need a real SA or VNA yet, it would collect dust most of the time. I guess I'd have to buy a bunch of over priced accessories too.
Any other good options to consider, or is the NanoVNA V2 Plus4 good enough for most stuff under 1GHz ? It does better than 1st nanoVNA, under 1GHz too. Anything similar in price/performance but in a benchtop model with a bigger screen ? It seems the NanoVNA V2 Plus4 comes with the basic adapters/cables, so thats nice.