Hi soligirl,
There are LOTS of different practice materials that you can use during your studies and most of them cost far less than the materials that you're asking about. As such, there's some question as to whether what you 'want' is actually what you 'need' or not.
Before you spend a lot of money on any new materials, it would help if you could provide a bit more information on how you've been studying and your goals:
1) How long have you studied?
2) What materials have you used?
3) How have you scored on each of your CATs (including the Quant and Verbal Scaled Scores)?
4) What is your goal score?
5) When are you planning to take the GMAT?
6) When are you planning to apply to Business School?
GMAT assassins aren't born, they're made,
Rich