I would love to buy this game myself, but I can never find it in-stock anywhere I go. And once I pay for shipping I feel as if I am ruining the point considering I beat it on PS2. If you can find it though, yeah, buy it!
@MatthewMeadows: I'd say the game is definitely worth $30 new if you haven't played the PS2 version, but from what I gather from the Giant Bomb page, the additions aren't major and I recommend you pass unless you want achievements or just really enjoyed the game.
I played and loved Bully for the PS2 but when I tried to replay it for 360 it just wasn't the same as I remembered. It just wasn't as good as I remembered.
I'd say it's worth buying again only because I absolutely love the game and loved getting to play through it with a few new missions and slightly better graphics. It doesn't feature an amazing amount of new features, but there was enough for me and I spent $50 on the game! I know some people reported bugs with the game, but I personally never had a problem with any bugs at all. I also just wanted to support the game because while it did sell well enough to become a GH on PS2...it didn't sell as well as it should have (pretty sure it didn't even break a mil).