There's a couple in Palo Alto and one in Redwood City, that ought to be fine for me.
In the meantime while I'm still on the east coast, I used the link you provided and just changed the state at the end and got Spas here also. Yeah, the names are a turn-off. The name of a particular one here offers a rather disturbing imaginary vision: "The Golden Mummy Day Spa" >:-P