Price comparison from amazon and Ebay ( Europe ) in real time

I need price comparison from amazon and ebay with single search bar.
For example :

- i text on search bar " pet feeder for cat "

- FOR AMAZON: search on amazon.it , amazon.de , amazon.co.uk , amazon.es , amazon.fr
- FOR EBAY: search on ebay.it , ebay.de, ebay.co.uk, ebay,es, ebay.fr

after search you have to show me all prices from all amazon website i indicate and sort from best price
and show me also all prices from all ebay website i indicate and sort from best price