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Still the cheapest. On top of that it's a domestic product so the fact that, "International sites may list the prices of items at their currency rate" is irrelevant

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The Amazon one seems cheapest at 5.57 but, "additional fees and service charges, called indirect costs, that can quickly accumulate also are a part of online shopping."

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I want to buy "The Little Book of Scientific Principles, Theories, and Things. I'm going to buy it online because,"Online shopping saves shoppers the trouble of waiting in long lines while offering the convenience of around-the-clock hours."

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By Conrad Kent