Redear Sunfish is another possibility. As far as Tilapia, Blue, Nile, Banded, and Redbelly are restricted. T. Mariae or the Spotted Cichlid, which I have very little knowledge about, are also supposedly legal in CA, from what I'm told, but they are considered an invasive species because of their aggressive behavior. There are several farms in CA that sell O. Horonorum, but as badflash notes, they may be hybrids or restricted to 'male only' sales for hybridizing with other strains.

T. Mariae are a substrate spawner, rather than a mouthbrooder which may or may not make it harder for youo to breed them, (depending on your particular circumstances), and are very aggressive and very prolific, from what I've read about them. Here are a couple of links for the T. Mariae that might interest you:
Clik
Clik