Used 3G Apple iPodLink
Cost: As low as $30! Maybe free if you ask around!
The iPod 3G is the weird mutant iPod with the four round buttons that was quickly natural-selected off the iPod evolutionary chart almost as quickly as it arrived. Why in the world is this *the* iPod to get? It's cheap, you can replace or extend the battery that's likely dead, and best of all, you can install Linux, making it into a 20GB+ high-quality voice recorder. That's right--the iPod comes crippled, but the iPod Linux project not only unlock it but offers dozens of new games, applications, and more.