"Forget patriotism -- shop at the .com: Eagle-eyed on-line shoppers who have been looking for DVDs or books for Christmas may have noticed something peculiar: In some cases, the same item seems to cost less at Amazon.com than it does at the Canadian version of the website, Amazon.ca. Of course it does, you say -- but that difference disappears when you convert the U.S. price into Canadian dollars, right? Not always. For example, if you buy the Shrek 2 DVD and the third Harry Potter movie together at Amazon.com, it will cost you $43.93 U.S., or $52.76 in Canadian dollars, and that includes shipping costs. The same bundle at Amazon.ca - with free shipping - costs $68.98. The major difference? Tax. The Amazon.com price doesn't include PST or GST. But isn't it your duty as a patriotic Canadian to pay those taxes? Sure it is - and you go right ahead. I'll be shopping at Amazon.com."