You can get any of those intakes in California from most online sellers. Even if they aren't CARB legal, you can still install it, you don't require a smog test until the 8th year of ownership (original owner). Even then, you can just switch it out between smog tests, which is every other year after the 8th year wait.
But just note, sometimes a cold-air intake could void your powertrain warranty, depends on the dealer you get, they are rather picky about intakes. Check with your local dealer first before you do this. The Mopar Cold-Air is the only one I know of that will not potentially void your warranty.
As mentioned, the stock intake is pretty good with cold air. K&N or AEM Dryflow drop-in filters would be good. If you get a K&N, make sure it has a good seal, that's where their drop-ins are sometimes hit or miss. If they don't have a good seal, the air will bypass the filter media and you get a new set of issues.
Also, there is a rather restrictive carbon filter on the top half of the box. You could remove that as well to improve air flow quite a bit, I believe there are only 4 plastic welds that hold it in place, a sharp knife will get it off pretty easily.
If you decide to do that, I would remove the top air box cover completely first, then remove the carbon filter, make sure it's clean of any bits of plastic or debris before you re-install it. If you try to cut out the carbon filter in place, you risk bits of plastic getting into the engine.