Theres lots of little nooks and crannys here on Vancouver Island that have a few 67-72 gems laying around. I have a personal little boneyard I go to where the guy usually has about 6 trucks for parting out. This area is basically the california of Canada, lots of these trucks still rolling around.
As far as brand spanking new? Too costly for me.
There is also a local parts supplier here in town but its a little pricey. He just orders everything from the states anyway and tacks on his shipping costs/profit. But if you need rockers, dash pads, door panels and most other accessories etc. etc. they be right on the shelf.
http://www.peninsularestoration.com/