First there a plenty of "civilians" available from Custom Dio, ADV, SOL, and other vendors... but most are in re$in... to save money, I often take the plastic figures cheaply availalbe from the like of Tamiya and DML and convert them. I "shave off" military distinctions like epualets, field pockets, rank insignia, etc., then use tin-foil, cloth, or most often, milliput to resculpt features desired. I once took a soldier standing at attention and turned him into a female bystander wearing a dress and sun hat! (I hear in San Francisco, this is actually quite common - and requires no milliput!).
Give it a try! Expand your reach... figures are CHEAP and if you make a mistake or two - so what?! Have fun and learn more with each attempt!