There is an E-Bay seller (WWW cyclery) who has them by the dozen. I
believe he lists them as water bottle cage bolts, then notes as an aside that they are the same Campy bolts that are used for toe clips on pedals. They are not expensive. See item #7105778723
I just rounded up 4 of them to send The gentleman seeking them. I questioned the seller as to why they did not come in those cute little bags and he swore they were Campy, but came that way in bulk to where ever he had bought them.
Tom Sanders
Lansing, Mi