if you didnt get to pre order odst dont worry. you have 3 other chanches.
1 the x2i contest
2 search sgt johnson @ ebay. there is a shit load of resaults of codes from 5-10 bucks.
3 and from the marketplace as a dlc... for over 9999 ms. over 1200 bucks in the real world. yeah.

10 years ago
The third one won't work, there is a cap on the amount of Microsoft points your account can have on at any one time and it is about 5-6 thousand I think, therefore you can never purchase it using points - only a redeem code. Microsoft put it at this price so you cannot buy it.

So yeah, either mine or someone elses competition or eBay is your best bet...