unless you want Stainless or Ti check you LBS. it may be different today but back when i was working in a store we often had dozens of them lying about. most bikes came with screws in the bottle bosses and sometime screws for other areas, lots of accesories also came with screws that were sometimes not needed.
you may not be able to get them in bulk but if you can snag 1/2 dozen every now and then that should do the trick
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“One morning you wake up, the girl is gone, the bikes are gone, all that's left behind is a pair of old tires and a tube of tubular glue, all squeezed out"
Sugar "Kane" Kowalczyk