Anyone have a good supplier for Balsa Foam?

[streetjudge79]

I'm going to try to make my first custom base for a 1/1 bust. I'm looking for a thick block of Balsa Foam. Does anyone here use the stuff?
Steve

 

[clonesix]

Here is a link to a taxidermy supply http://www.vandykestaxidermy.com/subcategory/129/


Balsa Foam is about 12 pound density, and this is 6 pound.