How's about this?
http://photorumors.com/2012/01/23/now-this-is-a-lens/
Its 200lbs but.
Also not sure you can buy it outside of US but maybe.
Could be a winner for astrophotography if you have a beefy mount.
I saw it listed on ebay for US$4500 as well. There may be more than one.
Greg.