just had a look for these on ebay and this guy looks the cheapest for them: http://cgi.ebay.co.uk/KB-SOUND-SPEAKERS-FOR-BATHROOM-KITCHEN-BEDROOM_W0QQitemZ140115068075QQihZ004QQcategoryZ112584QQtcZphotoQQcmdZViewItem
it'll be interesting to find out how the itrip thingy works with the ipod for...