Does anyone know where to get birch beer and other less common sodas in the Stonestown/Sunset District area?

I'm going to SF State for college next year, and I haven't been able to find any good spots yet. The only place in the whole bay I can consistently find birch beer is this deli in Martinez, but that's not an option since I don't plan on having a car while I'm in college and I'm not getting a round trip Amtrak ticket just for soda. Any tips are appreciated!