this post feels like deja vu. I feel like this was asked on VolQuest yesterday.
I think the main way to get numbers in bulk is through sign-up sheets at summer camps & combines. Scouts/writers show up at those to introduce themselves and many numbers are exchanged.
If you wanted to interview a player for a local newspaper, all you'd have to do is call the school and ask for the coach's extension. You speak to the coach, if he's not busy, and then leave the coach your contact info, so that he'll forward it to his player.
If the player feels like doing the interview, he calls you back.