Enevhar Aldarion
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Amazon numbers only include sales on their website. Many things, including WotC products, Amazon is willing to sell at close to their wholesale price. And even with the discount, it still only takes one or two books to get free standard shipping. So while their sales numbers may not accurately reflect overall sales postioning from all sources combined, the core books are still really good sellers. According to today's Sage Advice column, the PHB is into a sixth printing.