ASDA Minworth had their 256MB MP3 players at half price at £4.96. Probably done to match the recent Tesco offer. My kids are happy with them - but both had flat AAA batteries so they've probably been on the shelves at the higher price for some time.
USB 2.0, 256MB flash memory seen as a normal flash disk under Windows XP. Sound quality seems ok - in fact better than I was expecting for a cheap bit of kit.