I don't think you can buy directly from Mirka- PSI carries a package that has 2 each of the 5" sheets in 120, 180, 240, 320, and 400, for somewhere in the $11 or $12 range. We ended up buying at about a third of that cost in the bulk buy through a company called beaver tools
http://www.btisupply.com/SearchResult.aspx?CategoryID=370
you do have to purchase each grit in multiples of 50, hence the bulk buy using them. I liked the suggestion about contacting an automtive supplier- Body shops use the 16 1/2" lengths on their long air sanders. we had good participation on the bulk buy, but since it was a first time use for most of the participants, there were a lot that bought just two or three of each grit. Given all the positive feedback from the new users, might very well be enough interest in picking up a larger quantity to make it worth doing another group buy. I'll post on the group buy board and see what interest levels there are out here....
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