I think one of the terms commonly floated is Buns...

Though I don't think that will help in a web search, try foam plastics.

And I've found EPS panel companies happy to supply just foam, even custom orders, say snaf X 20 ½ " for wrap & strap, or sizes and thicknesses intended to be placed under slabs.

And I'll ditto Mike on the double chips and the packing.

"We build too many walls and not enough bridges" - Isaac Newton

http://bridgewright.wordpress.com/