With all the sub-$20 MP3 players out there, you can make your own MP3 player headphones with everything built in, MAKE Flickr photo pool member Csc934 writes – “Stephen needed a better way to listen to music on his run. There are no cables to tangle and it runs on a single AA battery. The mp3 player is a bit skimpy on memory, but it was affortable at around $20. It has usb jack for power and 1/8″ stereo to the headphones. The usb port came off an old macintosh computer.” – Link.