San Francisco elected officials struggling to deal with complaints about garbage piling up on the city’s sidewalks and streets have been waiting three years for a solution — only to get sticker shock when they heard the details this week. Addressing the problem requires a good trash can, but on Wednesday, a committee of the Board of Supervisors wrestled with how to replace many substandard bins when it learned that a batch of new, custom-made design prototypes will cost $12,000 to $20,000 apiece. When mass-produced, the cost per can will drop to an estimated $2,000 to $3,000. Still, supervisors balked...