Mentioned a few times on Amazon web services forums that this is currently not available
Rental Book Prices?
Is there a way to get rental book pricing from the API yet? I'm unable to find any documentation on this. For example: http://www.amazon.com/Accounting-Information-Systems-Marshall-Romney/dp/0132552620
Also, what about buyback pricing? This would be helpful too.
None of this is possible in PA-API (and unlikely to be in the near future with features being removed rather than added), sorry to disappoint.
via https://forums.aws.amazon.com/thread.jspa?messageID=378039񜒷
How to get book rental prices via the Product Advertising API?
Hi, I can see a number of websites (gettextbooks.com, bigwords.com) showing book rental prices. However there is no mention in the API docs how to retrieve the rental prices. Any idea how to fetch them?
Using the API, as mentioned, you can't. The only other way is scraping ... which I don't recommend.
https://forums.aws.amazon.com/thread.jspa?messageID=386374񞕆