I've a wonderful iMac G4 with 2 GB of RAM so I can install/upgrade from Panther to Leopard but I cannot officially buy from Apple site!
Is there a possibility somewhere to buy an original disk?
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Besides maybe posting to Craigslist for a better deal, 10.5.6 is still available for sale on Amazon.
Please know there was no PPC-specific version of the installer (it works cross-architecture), so if you find one it will work on that Mac (as long as its processor is 867 Mhz or faster w/ 9 GB of free disk space and a DVD drive). It was only Tiger that had separate installers.
One can usually find old versions of Mac OS on eBay.