I never tell people what to do, I can only give my Advice...
But in this one instance... You HAVE to buy the game again! Four or Five years ago, I bought Halo CE Platinum Hits Edition, it broke, so I bought another, my dog scratched that one so I bought one more, there was a problem with that one, so I bought two more... I ended up spending over $48.96 plus Tax on a $9.99 because I had to keep buying it from best buy... Point is, is that it was worth it, and I never regretted it.
Anyways, if you are still interested in the Xbox version, then here...
http://www.amazon.com/video-games/dp/B000067DPM