Spa Week is coming up, so make those appointments now! Various Bay Area spas are offering $50 treatments September 14-20.
For example, get a:
45 minute signature aromatherapy facial at Sports Club/LA's spa in San Francisco
60 minute full body massage at Surfaces European Skincare Spa in Berkeley
50 minute spa week facial at Red Door Spa in San Francisco
60 minute stress relief Swedish massage at Pure Envy Spa Bar in San Francisco
60 minute Sea Meets Stone facial at LaBelle in Palo Alto
Find out more at spaweek (though you have to register - it's free). And a warning, I don't think the website is fully intuitive.