I'm wondering if anyone can point me in the right direction of if/how I can obtain historical price data (ie. how much a product, say a specific CD, sold for) for Amazon or similarly for eBay, etc.

I think this would be a neat project for me to learn.

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    Aside from this question asking about Ebay, which the other doesn't, the questions do appear to overlap... – tomp Jan 2 '16 at 12:14