The SWG original media disks are no longer sold in stores. Most players look on eBay, or software sale channels to purchase a disk. E-bay typically has these disks for less that 20.00.
Once you obtain the media, you can install and then copy all the TRE files to a backup directory or offsite storage. You do not need the installation installed to play this game. Make sure you hold on to your disks and box
in case you are ever asked to show ownership of the client.