Coastside and Peninsula:
San Pedro Valley Park Visitor Center: 600 Oddstad Blvd., Pacifica (650) 355-8289
Sat/Sun 10-4 ... all+Pacfica
Florey's Books, 2120 Palmetto Ave., Pacifica (in Sharp Park District) ... all + Pacfica
Coastside Books, 432B Main Street, Half Moon Bay
Moon News, 135 Main St, Half Moon Bay (650) 726-8610... all + Pacfica
Half Moon Bay State Beach Visitor Center, Francis Beach, Kelly Ave., Half Moon Bay Sat/Sun 10-4
Harbor Seal Co., 406 Main Street, Half Moon Bay... all + Pacfica
Pacifica Chamber of Commerce, 225 Rockaway Beach Blvd, Pacifica... Pacfica only
Keppler's, El Camino Real, Menlo Park
plus REI, San Carlos
REI: San Pablo and Gilman, Berkeley
Maps Unlimited, 12 Sycamore Valley Road West Danville, CA 94526
Book Passage, Corte Madera
Book Depot, Mill Valley
Troop 80 Mountain Store, downtown Mill Valley
Mike's Bicycles (4th Street, San Rafael)
Sausalito Cyclery (north of downtown 1 mile at Marin City/101 exit)
Marin County Gift Shop, 2nd floor, Marin County Civic Center, San Rafael ...NM only
plus REI (Corte Madera) and various bike stores
Santa Cruz & South Bay:
Bugaboo, Pacific St., Santa Cruz...SC +Trail Center maps
Bookshop Santa Cruz, Pacific St., Santa Cruz...SC only
Henry Cowell Redwoods State Park Visitor Center, Felton, CA...SC only
Capitola Book Cafe, 1475 41st Ave, Capitola (831) 462-4415...SC only
Downworks, 222 River St, Santa Cruz (831) 423-9078.....SC +Trail Center maps
Seymour Marine Discovery Center (Long Marine Lab), Delaware St, Santa Cruz ...SC
Bay Books Monterey...SC only
And most Santa Cruz bike shops.
Borders Books stores also order Pease Press maps.
REI is back on the wagon again. You can find our maps at REIs in San Francisco, San Carlos, Cupertino, Berkeley, Corte Madera, and Concord.
Remember when REI had just one store in Berkeley, and there were independent outdoors stores all over the Bay Area? Although many have fallen, there are still some great stores with a human face, worth seeking out and supporting. Dom's Outdoors Supply in downtown Livermore, Mel Cotton's on W San Carlos Ave in San Jose, and Redwood Trading Post in Redwood City are three that we've found and grown to love. Also in this category (though I can't speak from experience) are Lombardi Sports in SF and Wilderness Exchange in Berkeley. (After that you pretty much have to go to Santa Cruz, Bridgeport or Bishop).
Dom's is especially useful if you get stuck in I-580 traffic on a Friday night on your way to the Sierras, and/or remember something you forgot to pack. They cater to both backpackers and car campers, plus hunters and horse packers (you can even get your truck seats upholstered, buy hip waders, or sort through a big bin of leather scraps; stuff you don't find at REI). They carry spare parts for my old frame pack as well as modern gear. It runs like a family business.
Lastly, a great big thanks to stores that have vanished: Marin Outdoors, G&M Sales, the Smiley Co., and Sunshine Mountain Sports, to name a few.