How about XPS foam board prices in market - Feininger
More on gluing, surfacing and repairing styrofoam
XPS Foam safety - getting started : r/TerrainBuilding
Choosing Rigid Foam - GreenBuildingAdvisor
STYROFOAM (Ravatherm XPS) In Multiple Grades & Sizes
I've been working with XPS foam lately. Here's a Dice Tower I made! : r/crafts
XPS Foam safety - getting started : r/TerrainBuilding
50mm Vinyl Leather XPS Foam RV flooring - TOPOLO RV
First time working with XPS foam for basing. Really happy with the results. C&C always appreciated. : r/minipainting
Cutting, Laminating, and Shaping XPS Foam
Working with Foam: Tips and Tools
Working with Foam: Tips and Tools
Basics: How to get good, clean, straight cuts in XPS Foam (Black Magic Craft Episode 030)
Frequently Asked Questions about Foam
100% Vergin Material White Color ISO XPS Foam Board for Cornice