well I have a Creative Zen Xtra 40gb player, which is very durable and has a lot of nice features (you can even make the music speed up or slow down!) and can be picked up for under £170 (about $310) which would include delivery etc. There are many to be found at
www.ebay.com , they are brand new and I would recommend the seller jc-connection, since I got mine from there and a mate got his there too, excellent service!