Well, not the cheapest maybe, but cheaper then famous iPod shuffle, yet providing a screen (a plus factor) Sandisk introduced Sandisk Sansa Express mp3 player in CES 2007. It is nothing, just looks like a normal pen drive & even works like one. U just have to plug the player into USB port & it charges on it's own. It has a inbuilt battery like many portable media players. For syncing just use Windows Media Player, or simply via any File manager. No drivers required so it will even work in Linux, as a pen drive. Plays mp3, wma, & DRM based WMA (the evil).