You can buy the Official IELTS Practice Materials. They consist of a booklet and an audio CD and contain a complete test for both the Academic and General Training Modules with an answer key.
You can also purchase How To Prepare for IELTS, a comprehensive book providing advice and practice in the four skills you need to do your best in IELTS. It includes a CD-Rom for additional exercises.
You can access comprehensive preparation and practice in every aspect of each of the four parts of the IELTS exam on the Road to IELTS CD-ROM. It contains over 120 hours of learning materials. All the above can be purchased at many IELTS test centres around the world. Please contact your local test centre for current availability