I've been using mine for a long time, purchased back when LMG Enterprises still existed. Amazon.com has a set of 8 cloths and a foam sanding block. Grits are 1500, 1800, 2400, 3200, 4000, 6000, 8000, and 12000.
http://www.amazon.com/MICRO-MESH-SANDING-SHEETS-INTRODUCTORY/dp/B000H6HIK2