The Alpine Inn was incredibly cheap when my dad and I went. The double room had 3 rooms: a bathroom, a living room w/ bed, and a separate bedroom. The two rooms with beds both had TVs. Even though they advertise WIFI, it's not there. I had to get my wifi off the Apple store.
It was $79/night, IIRC. It's in Daly city. If you exit the place, turn left, and get to the major street, turn left again, about 200 feet forward, there's a MUNI line that'll take you into the city.
The guy that worked there was nice enough. Free coffee and HORRIBLE, DISGUSTING danishes in the lobby. Each room is like a little cottage; A separate house.
It's right across the street from the big stadium. I think it's called the Cow Dome or Cow city. *shrug*