Ask HN: Whats the best way to find a H-1B job in the Bay Area?

Due to the general advantages of the Bay Area tech bubble I'm considering to move over from europe. While I am aware that most start-ups don't want to go trough the process there are probably a few bigcorps considering overseas talent. Whats the best way to find companys offering sponsored H-1B visas? Are there any specialized recruiters or job sites?