They are sold at evil bases. There if a faq on gamefaqs.com that tells you where each one is and how much it costs. You´ll have to be neutral with the criminal factions to get them all.
LOL. Nice plug for another website. You can find all that info right <A href=´http://www.lancersreactor.org/t/flships/default.asp´ Target=_Blank>here</a> on this site. Just find the ship, click on it, and you´ll see where they can be purchased.
