My brother got some foam sheets, and gave me one, and it's fantastic! Normally I just throw my guys, spread out, in a box-lid, and sit them on my lap in the car, trying to make sure the metal figures don't hit each other and scratch the paint off. Making use of one of the cardboard boxes my miniatures were mailed to me in, I've put a layer of foam on the bottom, then made another layer with holes cut out to the size of my figures.
This box now carries my kasrkin stormtrooper figures, and an armoured sentinel. If I get more stormtroopers (you can have up to 10 in a squad) I can expand my two squads by cutting more holes to add additional figures :)