Sources for recycled rigid foam?

Any ideas on where to find rigid foam? My only idea is the foam from recycled refrigerators but I've thus far been unsuccessful in locating any

I'd like to put foam under the floor and on the roof of a tiny home I'm preparing to build

You can get discount foam if you buy a tractor-trailer load of it.  It seems to go for about half price that way.  Foam type, thickness, and quality varies, but is stated ahead of time.  If you can get several households together it might pay.  Not free, but...

Dan