pink foam - Model Railroader Magazine

Weight is not the shipping cost, it's the size.  Also, it needs protection from handling in transit, set something heavy on it, when it is not on a flat surface and it could easily snap.  Even a large enough quantity to have some strength would be subject to bump damage, as it is soft.

I love working with the stuff, nice thing is that less than three miles awayis a yard that brings in several tt loads a year.  One bundle would do most modelers for a life time.

Good luck,

Richard