did you even look?
I found them easily on the first 3 sites I looked.
you'll have to buy the pins separate from the syringe, and just put the pin on the syringe yourself.
getpinz.com
look at "syringe only", and "needle only"
most places are discreet. The mailman will not know there are pins in the package unless he uses getpinz.com also.