* The ICS is a central hub for all nations, try checking here for
story leads.
* Its possible to trade between pilots, you can exchange goods
between your ships, have them arrive at the same point in space
and you will have the ability to [exchange] with one another.
* Trade ships are unarmed. You can make a quick buck by attacking
neutral trade ships and no government will get involved. Now all
you need to watch out for is your conscience.
* If you cant find what you are looking for, perhaps a Pirate
nation planet might have it? Of course, you will need to convince
them to let you use their markets.
* If you cant find the right story on a planet chances are it was
recently conquered by another nation. Try checking planets that
used to be under that nation.