I was born in California, and I just checked the Vitalcheck website. You do have a choiced of certified, or just a copy, but the cost is the same. Don't know why anyone would want just an uncertified copy.
Also if you were born in California, Vitalcheck needs a notarized form sent in first before they can get the birth certificate. California will only give a copy of a birth certificate to the person named on it, their parent/child/guardian or someone with power of attorney for that person. Part of post 9-11 security I suspect, and something I suspect other states will be doing.