PBFixIt.com Lists optical drive replacements for all Clamshells with firewire. The rev A and B's sans firewire don't have the ability to take a DVD drive, as far as I know.
You can find newer iBooks with combo drives for under 500, and likely around 300 with DVD/CD drive, if you want a bottem of the line iBook.
Try LowendMac.com to search. You can also search their site for info on upgradeing a Clamshell to DVD.
By the way, while the substution cypher you use is old as the hills, could you post a link to an automatic encoder/decoder application. I know what it says, but if you are using an application please (pl33z) post it. If not, I'll just have to code my own.
By the way, while the substution cypher you use is old as the hills, could you post a link to an automatic encoder/decoder application. I know what it says, but if you are using an application please (pl33z) post it. If not, I'll just have to code my own.