My son has an MP3 player of the same model.
It uses a standard USB A to mini-B cable also often referred to as a mini-usb cable.
These are common with mp3 players, cameras & phones & can be usually easily obtained on ebay http://search.ebay.co.uk/search/search.dll?sofocus=bs&sbrftog=1&from=R10&satitle=USB+A+to+mini-B&sacat=-1%26catref%3DC6&sargn=-1%26saslc%3D3&sadis=200&fpos=NR135LE&ga10244=10425&ftrt=1&ftrv=1&saprclo=&saprchi=&fsop=1%26fsoo%3D1&coaction=compare&copagenum=1&coentrypage=search&fgtp= or phone & camera accessory shops.
ren, April 2007