I'm sure they are totally illegal in California. Pretty much everything is. You can get a brand new one of pretty cheap manufacture but good utility for about $20 in Seattle - the OTF "Nato military knife". I have one somewhere in OD green, and it's fun to play with, but not a work of art like an old stiletto. Unfortunately, you never see good ones for sale really, because only law enforcement are supposed to carry them. I think people with one hand may be able to get a permit, though.
I'd love to carry one around, but I got in enough trouble when a cop took exception to my Ken Onion Kershaw assisted knife. I carry a regular Benchmade now.
Anyway, this site has a lot of nice examples: http://nicnac.net/en-us/dept_48.html