Are you fairly close to the USA/Canada border?
You could try these guys: Heinz garage 205 Wyandotte Street East, Windsor, ON N9A 3H5 - (519) 256-8161
http://www.heinzgarage.net/about_us.htmlThey are very close to the Detroit/Windsor tunnel. Its a VW, Porsche, Audi, & Mercedes garage.
I bought a german head they had sitting around a few years back ($200, no cracks between the valves, intake and exhaust manifolds included). At the time they were just looking to get rid of all the old IDI parts they had sitting around.
Another local shop with a bunch of parts cars sitting around:
All Cars 2580 Manning Road, Tecumseh, ON N0R 1K0 - (519) 979-4721
These guys are further from the border (half an hour at the most). However, I wouldnt expect any great deals.
I dont know where my Jetta with the 'new' head ended up. However, I was beating the snot out of towards the end so the head is quite possibly little better than scrap.