On the other hand...

Just because someone hasn't put out a press release or aren't listed in a media guide, doesn't mean they don't want to talk to reporters. In fact, if at one time they've let their phone number be put out ANYWHERE on the net, that means that they'd just LOVE to talk to you and spend hours answering your braindead questions. No, really, take my word on it. Any hour of the day or night, especially when you need that all-important second source, they'll be waiting right by the phone, a huge smile on their face.

And if their number is unlisted? It just means they're shy and need to be brought out of their shell. Nag their friends and neighbors until they cough it up.