I have been asked if I know of any mp3 player that comes with a power cord too, rather than just played via the batteries, whether rechargeable or not, they want to have a wallwart so when at home they can listen without the use of batteries.

Don't know why as rechareables would be the best route, but I thought I would ask the question.

Most of the hard disk MP3 players provide direct power options (eg Creative
range).

Alternatively, quite a few (eg iPods) have docking stations with power supplies
and speakers etc.