Just a follow-up. I did purchase iLife '09 on eBay and it works smoothly. A few hiccups. I mistakenly did an "upgrade install" of OS X, twice. "Upgrade installs" take a long, long time to do, and in the end, just don't work. It turned out that the utilities menu that I needed to access in order to reformat and do a "clean install' was pushed right off the screen where I could not see it, due to a faulty video driver matchup on the install disk. The result was that I wasn't sure what kind of install I was doing.
So, now I have a mini-Mac that works just like it used to, but really with no perceptible advantage to what I had before, just a few bucks lighter, and many hours of effort. The good news is that my older mini-Mac (read the Apple fine print carefully on which Intel processors do and don't work) will run Snow Leopard, albeit a little slower than Tiger. Hopefully, Apple technology and the various software upgrades required to browse the Internet will stay compatible with Snow Leopard for a while yet. But the Apple mini-Mac takes the cake for the poorest backward compatibility I've run across since I began with computers in the late 1960s.