It's definitely not a big review course as compared to Becker or Wiley, but NIU is an accounting powerhouse in Illinois. Everyone I know that used this course passed all 4 sections on first attempt with stellar results (proof I'm not the exception lol) In your case, you'll be happy to hear that they're #1 for the AUD pass rate. Below are the prices:
Audit & Attestation is $695
Business Environment & Concepts is $475
Financial Accounting & Reporting is $755
Regulation is $695
It is expensive, but worth every last penny. Each course provides mp3 lectures, books, and you can e-mail the professors directly and they will generally respond within 24 hours.
FAR 88 (07/15/11)
BEC 83 (08/31/11)
AUD 81 (10/15/11)
REG 83 (11/26/11)
Used NIU Correspondence CPA Review