www.ipodbattery.com, if it's outa warrenty it's 50 bux, free if in warrenty. I like my iPod, have it hooked into my Pioneer car cd player. It can also be used as a portable harddrive, nice for transfering lots of data around instead of burning cd's or dvd's. Also i installed an OS on it to test something out (on my mac).
Also i think apple is giving 10% off cupons for iPods, and if your a student (or know a student) you can get it cheaper. Amazon usually has cheaper iPods and dont charge sales tax.
BTW: I know many ipod owners (have owned 3, all 3 generations) and never heard of a battery problem or had one.