I think he means like random people. like fred and tom.
For a title how bout' Planktons Revenge
Why would mermaidman sell items to someone who is eeeeeeeeeeeeeeeevil.
Mayb if he steals them.
That could be Planktons weapons. At the begining Plankton, Manray and the dirty bubble who could be your party members and they could steal the weapons from mermaidman & barnacl boy.