ah you local. I got fit at Chain Reaction in Los Altos, I think it was 75 dollars. They do have a waiting list and a limited time they have appointments for. Once you get your initial fitting however, you can keep going back for free to tweak it a bit more and they go over your saddle, your handlebars, pedals, all of it. I'd call for pricing, however, it might have changed since I last got fit. Chain Reaction gets almost all my business because they are a) competent b) friendly c) knowledgeable d) don't talk down to you if you don't know exactly how to explain your problem with the correct terminology. Another place I would recommend is Mike's Bikes. I think they have finished construction on their huge new store in Palo Alto. They are a specialized dealer, and specialized has a saddle measuring system which assesses how far apart your sit bones are, and thus how big (wide) a saddle you need. I found them very helpful when I needed to find a good pair of insoles for my shoes, but I am not familiar with their fitting system. The Specialized BG Fit (the uber one) is very expensive, and not likely worth your time until you get pretty damn serious about cycling.
I rode the arione for awhile, but the shape kept cutting into my soft tissues (literally), so it was not the shape for me. it's a shame though, i love how it looks.
if it's sunny at shoreline this weekend, be prepared to do nothing but dodge little kids and purse dogs on the loose. if you have a bike rack, you might look at riding on canada road as part of it is closed to cars on sunday from 9am-3pm. you get to it via the edgewood exit off 280 i think (i generally ride there from woodside and am basically passing through).