I am using "Black Diamond", bought it at Northern Tools for around 5.99 a bag, does a whole lot better than sand in my opinion. You do have to have a good compressor to keep your blaster going. I also filter screen my used sand and reuse,I usually capture about 2/3 of my used sand.
Jason

[This message has been edited by JasonBullis (edited 06-18-2004).]