Thank you everyone, much appreciated.
They charge so much for a such simple cheap connector. I am tempted to just craft one out of plastic by hand. Or mold one using the male connector and some epoxy.
The price point probably has to do more with being obsolete than the manufacturing cost at this time. And as time passes they will ramp up the price just to compensate for the storage cost and low production runs.
Then again, a 3D printer might do the job.
And just noticing who you are, you could use your connections (pun intended) to get the banana power adapter 85024A-001 or 87405-20012
@free_electron, HP has been Agilent for quite a while. And you probably already know that