Might be worth giving Canadian Canoe Museum a call.
I don't see it listed on their website but they have had copies in the past and I think I saw a few- hardback in dustcover at a lot less than $75!!!- on the shelves last time there.
Chris,
PM me your address. I have a hardback copy which I am happy to send to you from the UK. I have read it twice and I am happy for someone else to have the enjoyment of such a good book.