Board Thread:Galaxy on Fire Questions and Answers/@comment-12219778-20130715201135/@comment-24208466-20131124081723

Kitau wrote: 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. All space lounges and hangars, including Kaamo are reset after you visit 3 seperate stations.