The discount is available using the coupon code MACR0913 which expires on October 6th at 11:59 PST. It is limited to one use per customer, and excludes games.
The discount can be used for any downloadable software (Mac or PC), including the just released Adobe Photoshop Elements 12 and Adobe Premiere Elements 12. Photoshop and Premiere Elements are Adobe's lower-cost photo and video editing software aimed at consumers.
MacRumors is an affiliate partner with Amazon.