Which part of california exactly are you going to ?? I was based near San Francisco (30 mins drive away) for a year.
of course, like mpenza said, its cheaper to buy online and get it shipped. helps avoid paying the 8.25% GST that california imposes. The catch is, the shop must be located in a different state. I've had fair deals with big names like B&H (in NY) and Andorama (NY), as well as getting used stuff off ebay (but must be smart. If it looks too good to be true, be suspicious.)