http://www.grainger.com/Grainger/ECONOLINE-Blast-Media-2MVR5?Pid=search I use the stuff from Grainger as well, a 40lb bag will last a loooooooong time. I've got some 3M polish, used to machine buff cars, I put in a little squirt in every batch of media. Pretty shiny! 8-) The stuff from drill spot i...