lbear,
I noticed you are in the Bay Area. Go check out Bay Area Reefers. They have awesome information and are the best reef club ever. Making an account is free and I recommend you buy the membership. Just go check it out. Search Bay Area Reefers.
I got my Black Ocellaris from the wild. They were in the LFS for 6 months and then I bought them. I've had them for 18 months or more and they are laying eggs. 90% or more of all clownfish will pair up easily and spawn in you aquarium. It may take a day to a year for them to pair depending on the personalities of the fish. There is always the option to buy a mated pair, however I wouldn't do so. It sounds like you're a beginner, and with the questions you're asking you probably shouldn't buy a mated pair because you may not be able to raise the babies. Get 2 juvenile clownfish of
any kind you like. When I was a beginner I limited myself to the orange Ocellaris thinking that all of the other clownfish would be difficult to maintain. I wish I would have known, but even though some are labeled "semi-aggressive" or "hard to keep", they are pretty much all the exact same with hardiness. I saw Percula clowns labeled as "semi-aggressive" which is why I didn't buy one. I got two 2-month-old Onyx Percs from an LFS about 1 year ago and I would actually say that my Black Ocellaris are more aggressive, probably just because they are a mated pair, but most clownfish (with the exception of maroons) aren't aggressive. So buy any type of clownfish that you like the most and in a few years when you have lots of knowledge in the hobby they will spawn for you and you can rear them.
