One reason the ebook vendors might be resistant to a price-comparison tool is that they say they have little control over prices, which are supposedly set by the publisher. But if that were really entirely the case, I suppose the prices would all be the same. I assume the vendors choose the amount of discount they want to offer, so this would make that more obvious.
An interesting feature might be a comparison between the ebook prices and the lowest price offered for a new p-book of the same title and author....
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