I picked up a set at 'Home Depot' ($12.99 on the clearance table, no less!) - it was packaged and marketed as a 'SCRATCH AWAY' Metal Sink Restoration Kit, but was nothing more than a set of micro-mesh pads and a bottle of 'Micro-Gloss' liquid abrasive (I haven't tried that one, yet)
here's a link to the same kit
it might save some shipping if you find it locally
-whatever
-Lou
EDIT: In digging through the instructions, it identifies the various pads by color and relative fineness/coarseness, but doesn't provide the exact grit ratings.