Hi Again hbquikcomjamesl!
Once an OS has been installed, the point upgrades, such as 10.1.x to 10.1.5 (Final) 10.2.x to 10.2.8 (Final), 10.3.x to 10.3.9 (Final), and 10.4.x to 10.4.10 (Pending), can be downloaded for free.
Tiger is available for purchase at
The Apple Store (U.S.).
If you know what to look for, a
Full Retail Version, of the
Tiger Install DVD, can also be purchased rather inexpensively, at some online Apple retailers, Amazon, eBay, FastMac, HardCore Mac, etc.
Be sure not to purchase grey, upgrade or machine specific CDs or DVDs.
The discs should look
exactly like the images in the above links, and not say
Upgrade,
CPU Drop-in DVD, or
"This software is part of a hardware bundle purchase - not to be sold seperately." on them.
Scrutinize these items
Tiger On eBay, very carefully, and if in doubt, ask the seller questions, before purchasing.
Additional info in these links.
Using OS X Install CDs/DVDs On Multiple Macs
What's A Computer Specific Mac OS X Release
Software Update, Upgrade: What's The Difference?
Before upgrading to any OS X version, check to see if your Mac needs a
Firmware Update.
If one is required, you must start the computer from a
Mac OS 8 or
Mac OS 9 System Folder on the computer's hard disk, not from a CD, in order to install it.
It appears that the
15" iMac G4, does not need a
Firmware Update.
If your Mac meets the
Tiger System Requirements, once
Tiger 10.4.x is installed, you can use the
PPC 10.4.10 Combo Update, to upgrade to the current version.
Additionally,
Tiger 10.4.x ships on a DVD, so if your Mac doesn’t have a built-in DVD-ROM player, you will have to use an alternative method of installation.
Info here
Installing Tiger Without A DVD Drive.
The
Tiger Media Exchange Program, referred to in that article, is no longer available.
Shop Carefully, Examine All Documentation, And I Wish You Success!
ali b