DTS,
Mudhole has some decent cork on overstock.....I usually order 50 at a time...about 2/3 is what i consider useable for a cutomer....which is pretty good actually. http://www.mudhole.com/Shop-Ou...25-ID

The good thing is you can use the pitted stuff to practice with. All you really need to shape a grip is a file and some sandpaper...I used to do all of my grips that way untill I bought a lathe.