In Cali, you can own and carry a sub-2" auto and be 100% legal. There's an entire submarket of CA legal autos, so you've got a pretty wide choice. Benchmade has the Benchmite, Protech has several including the Runt and Stinger, Dalton has several, Piranha has one or two, DKD has a couple, heck there's even a company called "California Knives".
For non-legal (in CA) autos, the laws get weird. It's illegal to sell, make available to sale, lend, give, etc a switchblade (including balisongs/butterflys), but it is NOT illegal to buy one. Go figure.
Interstate commerce laws are goofy too. For example, a 1.95" switchblade is legal in California, and any switchblade is legal in Arizona. But it's illegal to take the knife across the AZ/CA border. Go figure.
Of them all, I would recommend looking at a Protech Stinger. Cool little knife. You can get them in nearly any variety under the sun (including $350+ custom versions).