Hi,
They come up regularly on eBay - though not always with the lead (expensive). The listing below has one. Beware though - the end that plugs into the radio varies depending on model so the one shown may not work (haven't got details to hand but a search on here should give you more information). At worst there are adapter plugs readily available.
Here's a current eBay listing - there are others too:
http://cgi.ebay.co.uk/Freelander-CD-CHANGE...emZ170097875862It's a simple plug-in installation (with the right lead). The changer draws power and signal from the radio and your L/H Dot Matrix, Radio Display and steering wheel controls all adapt to reflect the addition of the changer. Quite a satisfying upgrade.
I hope this helps.
Roy