Seems like a good price, £13.00 at Amazon,
PocketParty Universal lets you share your tunes with friends, without the hassle of sharing headphones. Simply plug the audio cable into your MP3 player's headphone port to enjoy your music for up to 8 hours through the stereo's two drivers. Its robust design, including a cable storage compartment, makes PocketParty Universal perfect for slipping in your pocket and taking with you wherever you go.
* Links up via 3.5mm audio cable for use with any music player
* Cable storage compartment
* 1 x AA battery included