Well, there is no need to Purchase Oracle 9i CD's from market.
  Download the Torrent file, using Bit torrent or u torrent.
  Torrent file given in below link.  Follow all steps and screen-shots....

For Windows XP !!!

Step # 1,2,3...

1. Downlaod a torrent file given in the Link: http://www.mediafire.com/?bubr9u8i3iybw5m
    this torrent file contain 3 CD'S.
2. When your torrent file download complete, you should download WinMount software
    Link :  http://www.mediafire.com/?yg5dl242htf8403
    and install the software for creating virtual CD-ROM.
     It will help you for installtion.

3. When you are intalling winmount remember that it will ask you for option.. 
   A small form will open there all option are checked. Here to uncheck the RAR and Zip then finish it...     And see your torrent downloaded file (Disk1,Disk2,Disk3). It's ISO file...