Hi, you could try dealmac or Amazon. As for the dvds yes so I mostly just take the main feature to get a "tickle" better quality of the video so instead of compressing 7.5GB it ends up being 5-6 GB that's compressed. I really don't like "extras" but that's just me
As for external I have a LaCie 16x DL +/- that burns DL@4x (or maybe it's 6x) but any way I did this so if anything goes wrong I don't go without my iMac for a week. Plextor makes a nice external as well (my friend has one it's just $$$). Good luck
seeing as you're in america, i'd try newegg. you can get a pioneer dvr110 for $43. it's the successor to the drive currently shipping in power macs. it should work fine once you get patchburn