SuperDrive Options for Combo Drive PowerBooks?

inblosam asks: "I have a 800 Mhz PowerBook G4 Titanium. It has a combo drive so I can read/write CDs and read DVDs. I would REALLY like to make DVDs, but what is the best route? I know of one solution that will give me the upgrade for $400 so that is an option. But if they can get a hold of a superdrive and install it, why can't I? Where are they buying these or how do I find out how to get one for myself? Cheaper would be better, naturally. Is installing them a big factor? I also saw another DVD upgrade for the PowerBook, but it doesn't mention running iDVD, which would be one of the requirements for me actually upgrading. Otherwise I would just buy an external DVD burner."