Cyrus,

Kaplan charges between $1500.00 to $ 2000.00. The fees might have changed. So, call one of the Kaplan centers and get the exact fee. You should also be able to get that info from their website.

They provide an I 20 for  6 months.

As far as I know, Princeton also provides preparation classes.

If money is not an issue, Kaplan does pretty good with the test preparation courses.

Good luck with your GMAT Prep and school application.