[iBook] Upgrading my OS, Help!

[supergeek at comcast.net]

Ok, I'm still running 9.0.4 on my clamshell and want to upgrade to tiger this week. I also just had a combo drive put in last week but can't watch dvd's or burn cd's till i get a program or upgrade my OS. I've tried downloading OS 9 updates from apple but they won't install and they don't say why. My question is: where is the cheapest place to find the upgrade discs for 9?
Thanks in advance
Bob
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