Boston Globe had an interesting piece a few weeks ago on issue of Canadian readers unhappy over the high cost of books now that the Canadian dollar has equal (and on some days higher) buying popwer the the declining US dollar. US publishers have commonly marked the retail price of a book 40-50% higher for the Canadian purchasers. Part of this was due to the formerly high value of the US dollar against the Canadian dollar, but part was also due to the higher distribution costs. The Canadian bookstores can’t discount because if they do, they’ll take a loss on it.
The beauty of ebooks, of course, is that now that the dollars are close to equal, Canadian readers don’t have to pay a premium for books.