Board Thread:Galaxy on Fire Questions and Answers/@comment-12219778-20130715201135/@comment-13820228-20130816111520

You definitely can. You just have to go back once in a while. Missions and commodities offered by people in the lounges are refreshed once in a while. (Does any one know how often this is, or what triggers it?)

Maybe next time he'll be selling a different weapon. You just have to keep coming back.