Wing Commander CIC

I've been reading this forum for a long time just trying to figure out which ships you can actually buy and I'm very confused. In one thread it seems like you can buy a drayman. In other threads it seems like this is impossible. In one thread it says you can buy every ship in the game, and in another it says the only non-original ship you can buy is a demon. So what's going on here?

Can somebody who actually knows what they're talking about just make a list of the ships that are ACTUALLY available in the game? The latest release. No hex-editting or that kind of crap. What can I actually find? Right now I'm just flying around looking for new ships to buy without much success. I'm not even sure what I'm looking for. I don't want to spend hours and hours searching for a talon or a drayman just to eventually learn that you can't even buy them!