Sumvision M18 USB 2.0 4GB MP3 Player in Pink for £22.84 using Google checkout.
It runs from a single AAA Battery and isn't much bigger than the battery! Rechargeable AAA batteries can also be used.
This player supports the popular MP1, MP2, MP3, WMA, WMV, ASF, WAV and can even display the Track Names! Other key features include a Voice Recorder so it can be used as a digital Dictaphone, and a built in FM radio (20 Preset Stations & FM Record).
There is a separate USB extension cable to connect the player to your computer, or you can just remove the end cap and plug the player directly into your USB port
Battery type 1 x AAA
Operating system Windows 98SE/ME/2000/XP
Outputs 20Hz - 20KHz
Pc interface USB 2.0
S/n ratio 90db
Storage capacity 4 GB
Supported audio formats MP3/WMA
Supported bit rate 32Kbps - 384Kbps
Also checkout ebuyer as they too have them in 4 different colours and at almost the same price.
Here are the details for the ebuyer deal:
www.ebuyer.com and search for product M184GBBLK
or copy and paste the following linkhttp://www.ebuyer.com/customer/search/?qfind=M184GBBLK+&x=14&y=13