I know this has been talked about recently on the SF Board...but here's goes again.
I stumbled upon A.G. Ferarri at 3rd on Mission today with the intent to buy some gemelli pasta and a sandwich for lunch. While ordering my sandwich I looked down in the cheese case and saw this blob wrapped up in cheese cloth and leaves. It looked curiously like Burrata. It was the only cheese in the case to have no sign on it. I quickly statched up the last orb. It's the Italian version and costs $16.99/pound.
So, yet another source for Burrata in the city if you can't be bothered with the crowds of A16.