Are there any datasets on Amazon products' price history? http://camelcamelcamel.com/ doesn't make it available and the Amazon Product Advertising API doesn't seem to give access to the price history.
http://www.isbndb.com has a good API that uses XML calls/responses to get new/used prices from Amazon.com as well as a number of other sites like abebooks, half.com, etc...
You can also scrape (or better yet contact and ask the folks at) https://thetracktor.com which seems to have some great historical data.
EDIT - Adding example:
https://thetracktor.com/ajax/prices/?id=881549&days=90is the JSON response powering the graph at
https://thetracktor.com/detail/B0054JJ0QW/, for example.
EZSiteTracker’s Price Tracking Tool allows you to detect the price change of your favorite product/s online and get instant notifications via email. Visit: http://www.ezsitetracker.com/PriceTracking