They came to score a deal. They came to honor tradition. They came for the rubber elephant heads. On Saturday, hundreds of hopeful shoppers descended on one of San Francisco’s oldest and least-known neighborhoods, Bernal Heights, where 150 families had cleaned out junk from the deepest recesses of their closets and garages to palm it off on others for a buck. The annual neighborhood garage sale had record participation this year, raising more than $3,000 for the Bernal Heights Neighborhood Center at 515 Cortland Ave., said organizer Michael Minson.