Andrew,
The ceramic bead is made in France and I get it from Fusco Abrasives in LA (800-899-3872). It's call SEPR, Zirblast, B60 (grit size). It takes much less pressure to blast and there is almost no dust in the cabinet. It doesn't break up like glass does and leaves a dimpled finish, instead of a cut finish. The finish has to be 400-600 grit or polished as it doesn't hide any grind marks. It costs about $160 for a 25 kilo can (58 pounds) and it will last me 6-9 months with all the blasting I do.
One suggestion, split it with another maker or two. I think L6 did that.