There are so many out there it is hard to make a decision.
Only a few individuals here have experience with more than one nanoVNA,
with most acquired from vendors who may ship different versions at different times.
According to @gabuchan, there are 3 main sources for nanoVNA;
most here credit Hugen as the key designer of assembled devices,
but Hugen continually refines his design and reportedly sells mostly in China.
It seems likely that many devices on Amazon or elsewhere are by resellers of Hugen's devices.
Hugen confirmed that one acquired from NooElec was indeed one of his, but not the latest.
If USB-C direct attachment is important,
then a device with nanovna.com label on the back is a necessary,
but not sufficient (since easily copied) factor.
Meanwhile...
* NooElec is indeed the US supplier designated by edy555,
who created the original nanoVNA kit and maintains the primary firmware repository.
* Greg W4GAP's linked version IMO is almost certainly a genuine NooElec-blessed-by-edy555 NanoVNA,
probably by Hugen but, lacking the nanovan.com label on the back, may not be the most current design.
* The one linked by hwalker appears genuine, but vendor Leiyini does not appear to specialize in electronics
and IMO may be more likely to source items from multiple suppliers.
* Images for the item linked by hamrad88 are of a so-called "worse clone",
such as I acquired in July and has been satisfactory for my purposes
but less than ideal above 240MHz or so.
* For someone looking for a recent Hugen version >>only from Amazon<<,
the AURSINC version is advertised as "UPGRADED", so returnable if not...