Looks like there's an arbitrage opportunity in books over in the Amazon realm. Let's take a book like Types and Programming languages [1]. At Amazon.com, the price is $64.60(USD) [2], while over at Amazon.ca, the price is $51.74 (CDN) [3] (or about [4] $46.57 USD). And the book Structure and Interpretation of Classical Mechanics [5] is $57.40 [6] in the U.S.A. while again $46.57 USD [7] in Canada. And the situation is reversed for the Minix book [8]: $82.40 [9] in the U.S. and $117.85 USD [10] in Canada. What's really strange to me though, is that there are price differences in both directions. I could understand if for some reason, prices were generally higher in one country versus another (import duties/high real estate prices/etc.).

Of course, you can't easily take advantage of this because Amazon wants to charge you an $8 surcharge for international orders, plus another additional $2 for each book. Seems like someone living just across the border (maybe in Montana, with no sales tax, or Alberta, with no PST) could set up a business to make some cash by buying books from Amazon, to sell on Amazon's new/used book marketplace [11] (of course, shipping costs would eat into the profits, and if you really were reselling on Amazon, you'd have to pay their commission.) Anyway, you'll know that the global economy has arrived when this oddball price discrimination becomes unsustainable.