Price Comparison App

[AndroidNewby]

I (well, SWMBO, actually) am looking for the best price comparison app. I want to be able to input a product (e.g. Highland Park malt whisky) and have the app tell me either a) the best price it finds and where I can buy it or b) all the prices it finds so I can work out where to buy.
Can't find something like this in the app store. Can anybody help, please?

Thanks
Android Newbie

6Sep14 : Lots of views but no suggestions. Anyone got a view, please?