GMAT Study Material/Course Info - INDICATIONS

Hey, Inter Nations Folks!

I'm considering taking the GMAT early next year and I'm doing some research here in Bangalore (India) about training courses for the test. I've called Chopras and Princeton Review and the average cost for 60h preparation classes is around U$470 and for 72h around U$510 respectively, with study material included plus other benefits.

For the expats who already did the GMAT, how much time/money did you invest on it?
Are these values realistic comparing to the Cy where you live?

I'd be glad if you could share your perspective on the topic!