I love the smell of brutally savaged price tags in the morning. Microsoft has taken the axe to four Halo titles as part of this and next week's Ultimate Xbox Live Sale, which covers over 60 titles.
Some of the reductions are less attractive than others - £20 for the antique Halo Wars is asking rather a lot, good as the game is (Update: apparently this particular game hasn't actually been reduced, despite being listed as such - ta FishyGinger). Hope you find something that's worth your time.
All these offers are good for today only. Watch out for another set of discounts tomorrow.