Just for the record:
1. Balisongs are fully legal in California if the blade is under 2 inches.
2. If the blade is larger, it is illegal to carry on your person or in the passenger compartment of a vehicle in a public place.
3. It's also illegal to give away, sell, etc an auto.
4. Nowhere does it say that it is illegal to possess a balisong
Butterfly knives tend to be either cheap Chinese ones that will fall apart, or high-priced niche market knives. There is, however, the Bradley Kimura series, which is a solid reliable knife that doesn't cost too much. I'd recommend you get that if you're interested in butterfly knives. As for how these open, you're just limited by your imagination. There's an art to finding many interesting ways to open and close butterfly knives using inertia and wrist manipulation. Take a look around youtube if you want to get an idea.