REMINDER: Premier Support for Oracle Database 9.2 ends in July 2007 The 9iR2 premier support just ended.
Now the 9i is under Extended Support. The good news, it is free until July 2008!
First year Extended Support fee waived for Oracle9i Database Release 9.2
Laurent,
so what is offered and not offered with the extended support?
as I can read in the link I provided, you got CPU at no additional cost. But there is no more patches. You can also open SR. As far as I can read, it is free, you just need to have a license for your software, but 9i support is free from 1 August 2007 to 31 July 2008.
For a more accurate information, contact your sales representative