Try searching "camera case foam" and "foam case fill". I think you wiull find leads. I have a local electronics place that stocks speciality tool cases. They carry it as well.
Also search for "closed cell foam". Here is a description of some types. http://www.foamorder.com/closedcell.html I bought some from another supplier to line drawers that is "too hard" for packaging locos. Good idea to ask questions about the possible reaction with loco paint also. I think most polyethylene is non-reactive. Ben
