If you just want to write games for your Windows PC it costs you nothing. The tools are available for free from creators.xna.com and you can start immediately. The only thing you might like to buy is an Xbox 360 gamepad which you can use to control your games.
If you want to write games for your Xbox you must have an Xbox Live account (silver or gold) and be a member of the XNA Creators Club. This will cost you 99 dollars a year, but if you are a student on a full time course you will probably qualify for free DreamSpark membership.
Last updated on April 3, 2008 by Rob