These people have some in stock - but I do not know how reputable they are.
http://www.johnbrown4x4.com/current-stock

There is a lot to look out for - please take someone knowledgeable with you to look at any prospective purchase.
One point - if it is not leaking oil, there is not any left!

Paul
Costock, UK
Plus Four 75th - Furka Rouge - Pip
Disco 5
Teddy - 17h1 Irish Draught cross