I just picked up 100 pounds of the stuff from a supplier I found in Baltimore. 30 bucks for 50lb bag of black s-grade. The girl told me they had plenty of colors and both grades available. They are also in the proccess of getting a new supplier of a similar material for when they run out of 3M. If you would like their info PM me or mods if it's not against forum rules to post their info let me know. They were super friendly and wanted me to let the rest of my fish people know who/where they were.