Donors' contributions to a 501(c)(3) organization are tax-deductible only if the contribution is for the use of the 501(c)(3) organization, and that the 501(c)(3) organization is not merely serving as an agent or conduit of a foreign charitable organization.
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.
There is a one-time enrollment fee the first time you take Level 1. Other than that once-per-lifetime fee, fees are the same for each level. Levels 2 and 3 are only given once per year. If you fail in 2013, then you have to wait until June 2014 to take the test again. This is one reason why the CFA exam is so much harder than other exams.