I've been looking for a source for differently shaped cubes, blocks, and disks, and in an assortment of colors.
Are the ones you're using from another game, or did you find those separately online somewhere?
Somebody on BoardGameGeek ordered many cubes (and later discs) in bulk, then sold them off in lots of 100 pieces x 12 colors:
http://www.boardgamegeek.com/article/3406660
If you get an account on BGG and GeekMail him, he may have some left or be able to tell you where he got them.
There are also places like these:
http://www.meeplepeople.com/products.php?cat=44
http://www.spielmaterial.de/english/