Maybe try contacting MassBike? In the DC area, both the local nonprofit (Washington Area Bicyclists Association) and the Arlington County bike program (BikeArlington) have bike light/vest/reflective strap giveaways, so MassBike may do something similar.

To get an idea of what I'm talking about, check out photos from BikeArlington's light giveaways: http://www.facebook.com/media/set/?s...2804667&type=3