You can save $5.00 on preorders of Batman: Arkham Asylum through Amazon by using the coupon code "5OFFARKM," in addition to Amazon's existing discount, making the PC edition $39.99 and the console editions $47.99, with an Amazon-exclusive "The Road to Arkham" comic book as a bonus (thanks dealzon). Also, Steam announces they are offering a 50% discount on Trackmania United Forever for the next week.