The CS2 Suite is over $1,000 ... and the upgrade version is around $400. No way that price quoted above is right ... student discount or not. Are you sure you have the suite, i.e., InDesign CS2, GoLive CS2, Illustrator CS2???
The standard academic price is about $400 for CS2, but many larger universities work out special offers with companies like Apple, Microsoft, and Adobe in order to make software less expensive.
For instance, Windows XP Pro is normally $299. The academic price is around $100, and at some universities you can get it for as little as $25 per license.