As title, Creative Zen Stone 1GB for £9.99 and 2GB for £16.99. Seems a good price, cheapest on Play and Amazon are at least £10 - £15 dearer. Availability presumably varies, but a large enough Xtra-Vision should have them. Good luck!
Creative Zen Stone MP3 player 1GB for £9.99 / 2GB for £16.99 from Xtra-Vision - Instore