I once asked a freind about ships labled "rare" in the rules section.
He said something along the lines of
"The only way to get them is to ask an admin, you pay them CP's or credits, I can't remember wich, and then they make it over to you."
And then I said
"So is it teleported to your location like in the CP exchange? Or do you have to go and pick it up somewhere?"
"Yes, it's teleported to you."
Rare and unique ships cannot be produced. Some were previously introduced to the game (or were previously produceable or could at one point be acquired with CPs) but new entities are no longer being created.
This means the only way to get your hands on a rare or unique ship is to purchase it from someone who has already got one and is willing to sell. Most of them, with the exception of ships like the N-1 (a former CP exchange ship) are going to be fairly expensive.