I'm constantly amazed how cheap stuff is today compared to 20 years ago.
VNA's seem to be an exception. You can buy hobbyist VNA like the MINIVNA but they are really a compromise.
Even used VNA's aren't cheap, I got lucky and managed to pick up a near mint condition HP8953C with an S-parameter box and a full set of HP N Calibration standards along with 10 HP N attenuators 2 each 3db 6db 10db 20db and 30db oh and I forgot a set of HP APC high precision calibration/verification standards with the HP dial indicator depth gauge all in a very nice Pelican case that had been custom fitted with pink anti-static foam. He even threw in another pelican case full of Agilent /HP APC and N connector adapters.
The kid had been trying to sell this stuff for over a year at local ham swaps with no takers, ham radio nowadays is really nothing like it used to be, Its deteriorated into nothing more than glorified CB. Most hams nowadays can't even use a DVM and just don't know what or how to use that type of gear.
Heck I heard a ham on a local repeater about a month ago ask what a VFO was he was reading an article that mentioned one and he didn't know what it was and he was a newly minted extra
But hey throw out a cheap Chinese antenna analyzer and they will fall over themselves trying to buy it.
Anyhow, I ended up trading a DJ phantom 3 drone for it that at most was worth probably $500, I told him that the equipment I was getting was worth much more but he didn't care he was just happy it was going to someone who could use it.
The Calibration standards alone where worth twice what the drone was worth. The kid had inherited it from his dad and had no idea what to do with it. I knew who his dad was and know that he used to own an HP certified calibration and repair facility. This was his personal VNA that he had custom built from hand selected components. HE spent years cherry-picking parts out of donor boxes to build it. Even the S-parameter box is built from hand selected parts.
It's in absloutly mint shape and was quite the find.