I found these on canada ebay. Bayviewman also does crook knives and other stuff. It doesnt show up on an ebay uk search for "elbow adze" even from international sellers?? 
He says he could produce an adze blade (no handle) so as to build your own tool for around $40 plus S&H
http://cgi.ebay.ca/NW-coast-style-w...emQQptZLH_DefaultDomain_0?hash=item5886d4b6bc
http://cgi.ebay.ca/NW-coast-style-w...emQQptZLH_DefaultDomain_0?hash=item5886d4cdd7
Might be of interest? Cant vouch for the guy as havent traded, only email contact as yet. But he and his brother are carvers and shoulld be able to make usable tools.....just a thought
cheers Jonathan

He says he could produce an adze blade (no handle) so as to build your own tool for around $40 plus S&H
http://cgi.ebay.ca/NW-coast-style-w...emQQptZLH_DefaultDomain_0?hash=item5886d4b6bc
http://cgi.ebay.ca/NW-coast-style-w...emQQptZLH_DefaultDomain_0?hash=item5886d4cdd7
Might be of interest? Cant vouch for the guy as havent traded, only email contact as yet. But he and his brother are carvers and shoulld be able to make usable tools.....just a thought
cheers Jonathan