Kaufmann's Cameras Inc
154 W 25th Ave
San Mateo, CA 94403
Open Weekdays 9am-6pm; Sat 10am-4pm
Very good selection of negative and slide films, b&w/color, friendly, helpful, sells camera and lenses (new and used) darkroom chemicals (including Acufine), fiber papers, trays and everything you need for wet processing. Reasonable prices. Offers in house wet processing for b&w, sends color negative films and chromes out to third party, short turntime. I would rather frequent their stores than K&S in Palo Alto for my photography supplies.
304 E Santa Clara St # C
San Jose, CA 95113
The only place in South Bay (San Jose vicinity that is, CA) that process 120 films and slides in house (and 35mm of course). Friendly, helpful, good turntime. Comparable pricing (to A&I or BelAir). Sells a small selection of negative and chrome films. If you want your 120 films processed on site, this is the place to go.
Just Films (a smallish corner store that has seen its fair share of industry consolidation, it is currently operating at the following location)
130 Russ St.
San Francisco, CA 94103
Sad but true, this seems to be the only place in SF where you can find a small but decent selection of films. Because it is a one man show, the owner, Volker may not be there all the time, call ahead before you show up so your trip is not in vain.