In case nobody has made this public, below find some part numbers for useful or absolutely required fittings and adapters.
A couple of each are en route to me right now. (From Digi-Key. Not Mouser. I gave up on Mouser after three orders in a row were screwed up, costing me serious coinage and time lost for five different jobs.)
Digi-Key part numbers:
ACX1242-ND SMA Jack-Jack (like the one shipped with most NanoVNAs)
ACX1240-ND SMA Plug-Plug (exactly the opposite polarity of the 1242 above. Might be handy setting up a DUT, you never know...)
ACX1246-ND SMA gender - mender. This is a male to female converter
J10097-ND SMA to BNC converter. Most of my stuff is UHF connectors, SO-239 / PL-259, but I already have adapters for BNC for that.
Digi-Key (and likely Mouser, if you prefer them - I don't have a dog in this hunt so get it where you like) has roughly a thousand different SMA to --something-- adapters and fittings. (The SMA to SO-239 adapters are way-stupid-over-priced as far as I can tell, but most of the rest are just ugly expensive, same as everywhere else... Adapters and connection cables and fittings are going to wind up more expensive than the VNA itself, I am afraid.)
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Wes Will
N9KDY