You can find publications of Source Press at the following stores and infoshops:

Needles and Pens- 3253 16th St, SF
Modern Times- 888 Valencia Street, SF
Bound Together Books- 1369 Haight Street, SF
Rock Paper Scissors- 2278 Telegraph, Oakland (take a look in their zine library)
Long Haul Infoshop- 3124 Shattuck Ave. Berkeley (take a look in their zine library)
The Ecology Center Store- 2530 San Pablo Avenue, Suite H, Berkeley
SubRosa- 703 Pacific Ave, Santa Cruz