If you are from the states the district health unit is called the health department. So supervegitto is right, go get them from there. It's part of the anti-AIDS program where they give people who use drugs free needles so they don't swap with other people. Some larger cities call them needle recycling programs, so depending on where you live you may have to turn in your old ones to get new ones. But regardless, never reuse, it's not worth the risk.