Where can I find large blocks of styrofoam, free, in the Chicago area?

I am making halloween props and need really large pieces of styrofoam.

Kiteman5 years ago
See Onrust's idea, and consider visiting TV and "white goods" stores and offering to take their waste styrofoam off their hands for free.
onrust5 years ago
https://www.instructables.com/id/Recycled-Styrofoam-Block-Insulation/