I picked up a 10 pack of stainless steel (316) socket head cap screws (M8, 16MM) to replace my slider bolts.
http://www.mcmaster.com/#92290a418/=8yyor9
All told, it ran me $14, and now I have extras. If anyone wants a few stainless bolts to replace your button head screws that are bound to round out, let me know, and lets make a deal.
-K29er