As an alternative to Japan, I'm also looking into importing from the US. This looks like a fair shake to me for $10k, yes?
http://cgi.ebay.com/ebaymotors/1997-Toyota-Landcrusier-40th-Anniversay-Locking-Diffs_W0QQitemZ220015825013QQihZ012QQcategoryZ6443QQrdZ1QQcmdZViewItem#AboutUs
http://cgi.ebay.com/ebaymotors/1997-Toyota-Landcrusier-40th-Anniversay-Locking-Diffs_W0QQitemZ220015825013QQihZ012QQcategoryZ6443QQrdZ1QQcmdZViewItem#AboutUs