I picked up my first GMAT books back in December. I didn't really have a plan for studying, I just knew I needed to take the test sometime before this fall. I'm guessing, based on my initial tests, that I would have scored somewhere in the mid 600s had I walked straight in the door. I figured I needed at least a 700 to get into the schools I'm looking at.
I bought Kaplan's 2010 guide, GMAT 800, and Kaplan's Math Workbook on my first trip to the bookstore.
I live in Thailand, so I am unable to buy books (at least, non-NYT bestsellers) without an enormous amount of effort. Luckily, Amazon invented the Kindle. I was also able to download the OG and the Kaplan verbal workbook.
Finally, I purchased the BtG practice questions and signed up for the daily math and verbal questions. I ended up ignoring Kaplan's Math workbook, but answering some or all of the questions available through all of the other sources.
I figure I answered over 2000 total practice questions over 5 months, about 15 questions a day on average. I spent about $450 on practice materials and the test, not counting the hotel in Bangkok.
I took the test on Monday. 720!