The Canadian loonie is at par with the American dollar

Why then are we still paying a huge differential when we purchase books in Canada? I want to read Richard Ford's novel The Lay of the Land. I checked out the price on Amazon.ca and on Amazon .com. The Canadian price is $15.33. The US price is $10.17. What about the latest from that Canadian icon, Douglas Coupland? The Gum Thief is even more egregiously priced at$29.32 Cdn while selling for $16.47 US. Books are more expensive here than in U.S. stores, largely because of outdated exchange rates used to calculate Canadian prices. Book prices here haven't changed since our dollar was worth $0.65 U.S. One can't expect prices to change with every fluctuation of the dollar but this is unconscionable.
Living in a border town I can just nip over to the US to snap up bargains but that is hardly the point.
This is just one example. I shudder to think about all the other industries that are ripping us off.