UPDATE, I have change supplier so the XPS foam is now black rather than pink as in the some of the photos but it is the same product, any questions
XPS Foam Board 2 Thick-SINGLE SHEET-Modeling Gaming Dioramas
Pink Foam Sheet
XPS Craft Foam for hobby crafts, wargaming scenery and terrain building Comes in the following sixes ideally suited to cutting and scoring.
XPS CRAFT FOAM SHEETS, WARGAMING & HOBBY FOAM, TERRAIN, SCENERY 6mm - 50mm
Foam Terrains
Craft Foam Sheets - UK
Modeling Foam - UK
Terrain Tutorial: Making A Stone Bridge Of XPS Foam / Styrodur
Making XPS Foam Bricks the BEGINNERS Way! TERRAIN BUILD!
XPS Foam High Density XPS Foam. 4cm X 58cm X 30.5cm - Australia
Xps Terrain - Australia
Miniature Gaming Terrain - Hot Wire Foam Factory
XPS Miniature Terrain Foam .5 x 2' x 2' (25 PSI) - Black Magic Craft
Wargaming Terrain Xps Bricks - Norway
Xps Terrain
Foam Terrains - New Zealand