I just did a check on our MLS and there is nothing on our system. There are a few companies that strictly deal with rentals. Give them a call directly as they may have something coming up or not on the mls,
Foundation Rental & Relocation 415 507-9600 or Prandi Management: 415 482-9971.
The other option of course is Craigslist for any owner or landlord who is renting without an agent.