Amazon Scraper - Check Search Ranking for Given Keywords

Hi I would like a simple scraper producing, to ascertain our Amazon search ranking for given keywords. It can be web based or a standalone program, though we would prefer web based. For each Amazon ASIN we wish to monitor, would have a number of keywords for which we need to know the organic ranking. We would like the facility to add to this list of ASINs and keywords when required, by ourselves. Also we would like to be able to select which of the Amazon platforms (.com, .[login to view URL], .fr, .de etc) the searches are performed on. Sponsored Ads must not be counted when ascertaining the organic rankings. The scraper would be scheduled to check all of the rankings once per day, and record the ranking for each keyword on each date. We would like the facility to download this data to CSV/Excel file. Please let me know if you need any more information.