There aren't many shops at all in these areas! I can't imagine a bike shop could easily sustain a business in Woodside or Portola Valley... On the plus side, PV is quite pro cycling at the moment - I should know, I'm on the town's official "Bicycle Pedestrian and Traffic Safety" commitee, and there is a very strong bias towards cyclist representation amongst the 9 members.
Ed
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Get a bicycle. You will certainly not regret it, if you live.