Amazon: $5 of free MP3 when you buy $25

Amazon just e-mailed me an announcement: if you buy a minimum of $25 worth of stuff from their Music CD, Audio/Video, Camera, Photo & Video, Office Products, PC or Wireless stores in a single order, you get an instant $5 credit at AmazonMP3. This is particularly cool because AmazonMP3 has a long list of albums priced at $5 and under.