Another correction: those starships are not exclusive. You'll be able to get them in-game by playing.
Actually I just saw a video roundup with Chris Roberts who answered some questions from the community and he stated that market gear is exclusive, much like our own is. The only way to get them is to buy them from the store or from someone else who is selling theirs in the game. You will not be able to conventionally earn them (i.e. not mission rewards or loot drops), just like most of the Cartel Market gear.