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Expect ~$1,000 USD per exam for the exam fees and the CFA Institute books. Most people will also use a third-party self-study packages, which include practice exams, condensed books (the CFA ones are 2x+ longer), study tips, online question banks, etc. Factor in an additional $500-1,000 USD per exam for these. Schweser is the most popular study package: http://www.schweser.com/cfa/. No matter how diligent you think you are, most people I know took an additional 5-10 days holiday in the run-up to the exam.
The Chartered Financial Analyst (CFA) exam is this Saturday and test-takers are probably freaking out. The CFA, which has three levels, is considered to be the most difficult test on Wall Street with fewer than 20 percent of candidates passing all three on the first try. The average test-taker also spends a solid five to six months preparing for the CFA. That's not the only reason they'd be freaking out, though.