You can find the original article here. I've found stencils on the streets here, mostly on stickers.
Arts Picks: Books
Russell Howze is takin' it to the streets. Hitting the road this month in support of his summertime release, Stencil Nation: Graffiti, Community, and Art
Tonight's one-hour presentation will focus on an overview of the art form, verbal and visual, including a slide show, examples of stencil art from around the world and actual cut stencils. In addition, Howze plans to go hunting for some of Philly's own stencil art. "I'm looking forward to wandering some alleys and streets in Philly so I can find some work to put on my Stencil Archive Web site," says Howze. "It'll be good to go back to the source of modern graffiti as we know it, which started in Philly and blew up in NYC soon after. Personally, I think I enjoy discovering it more than anything."