It's hilarious that not a single one of these has pricing listed anywhere public.

I don't think they expect anyone to actually buy these.

Most companies looking to buy these for developers would ideally have multiple people share one machine and that sort of an arrangement works much more naturally with a managed cloud machine instead of the tower format presented here.

Confirming my hypothesis, this category of devices more or less absent in the used market. The only DGX workstation on ebay has a GPU from 2017, several generations ago.

How much do those workstations cost? All of the different manufacturers links on that page lack pricing info and you have to contact them for pricing.