your local hardware store or hobby shop should stock epoxy, I would suggest getting both 5 minute & 20-30 minute epoxies(if you have to pick only one, go with the longer cure). Madcow sells rail buttons; http://www.madcowrocketry.com/servl...ton-Pack/Detail as do appogee, Loc, and PML.
as for a rail pad...I would suggest DIY, they can be rather spendy(apogee lists them for $500, they also list the rail itself for $80). if you have a club near by contact them, they may be able to help you find/make one for a good deal less.