Hi Laythesmack,
the Math Refresher is $499 by itself, but only $299 when purchased with our course.
For self study, there are two options. The first is Kaplan Premier, available through Barnes and Noble, Amazon, Borders, and other major book chains. This book contains all the Kaplan methods, practice sets, all the math and grammar you'll need to take the test, and a CD with 5 full length CATs. It's a great resource for people who want to prep quickly on their own, and can learn from a book.
However, some people need the guidance of a Kaplan teacher, have trouble learning directly from text, or simply want to do more practice than the Premier book offers. For those students, self-study through Kaplan's Premium Online program is available. The Premium Online program gets you all of the online tests, workshops, and Lessons On Demand available to our regular GMAT classroom students--in short, you get everything but the Kaplan teacher. It's an excellent study option for self-motivated studiers who want to spend a lot of time working on a lot of subjects.
For pricing for the GMAT, GMAT Advanced, GMAT Premium online, and Tutoring packaged, check out the Kaplan GMAT website (in my signature); it should lay out all of the options for you. Our Kaplan classes are 9 sessions, so even a once-a-week class should leave you time to spare for a test day three months from now, if you sign up quickly.
Let me know if you have any more questions!