Search Different websites for same Item

I am looking for a way to search may different webstes for a certin items.
The Idea:
In the back end I will input what websites to search.
On the my website the user type in a search bar what they are looking for and the app will search the websites that i have added to the backend and will give the results as to where the item is and the price.

Any ideas on a plugin for this or how to set it up would be a great help.

Thank you.