Don't you get these kind of kits from the Far East in the UK? Fairly inexpensive. they come in all kinds of flavours: nuts & bolts, SHCS, snap-rings, clevis-pins, o-rings, cotter-pins etc etc including roll-pins.
Looking at the Machine Mart ads I would have guessed them to have this kind of thing.
Edit: I just checked and they list them here.
Edited By OMG on 04/07/2014 21:59:19