Shaw's Cycles in Santa Clara carries Pistas. They're $550. Great shop.

http://www.shawscycles.com/
45 Washington Street
Santa Clara, CA 95050
408-246-7881

Reed's Sports in San Jose had a San Jose and a Fremont the last time I checked.. don't know the prices and have heard mixed things about the shop.

http://www.reedssportshop.com
3020 Alum Rock Avenue
San Jose, CA 95127

I haven't seen either of the other bikes anywhere in the South Bay, but I obviously haven't been everywhere. Where did you find the Steamroller?