After doing some research this not possible in the API, however you can parse the HTML of the standard page to get the details:
1) Use http://simplehtmldom.sourceforge.net/ for parsing HTML (If your not using php, you'll need find something similar)
2) CURL (make sure you set your header or amazon will error) both http://www.amazon.com/gp/offer-listing/B007IJQDQQ/?condition=new and http://www.amazon.com/gp/offer-listing/B007IJQDQQ/?condition=used
3) To handle pages count total number of offers (found #new span.numberreturned) and divide by 15 to work out number of pages.
4) You'll need to parse each page, URLs would be like some:
eg page 2 http://www.amazon.com/gp/offer-listing/B005IMB5SG/?condition=used&startIndex=15
eg page 3 http://www.amazon.com/gp/offer-listing/B005IMB5SG/?condition=used&startIndex=30
Hope this is enough info to get you started, sorry I don't have access to the working script I wrote a while ago.