When you need unlicensed/illegal weapons, clandestine transport, or illicit information, then you’re going to need to deal with the black market.
You’ll need to find a Broker, then you can begin to build a relationship with them. You might be able to get a few tidbits or bits of tech at first, but it will take a while before they’ll offer up the good stuff.
The black market exists everywhere in human space and sometimes beyond. The brokers have networks set up almost everywhere.
The city of Farport on Ares has been a hub of illegal trade and dealings for over a thousand years.