In the latest newsletter from the Compleat Sculptor, they had this section titled
Clicking the link, it's showing this stuff called Corafoam. I never got to use Balsa Foam, but knew it was a little on the expensive side. The same holds true for this stuff.Miss Balsa Foam? Don't! This is Better.
But anyway, here it is as an FYI:
https://shop.sculpt.com/foam/urethane-f ... afoam-4lb/