Looking for a shop search script

I am looking for a simple script to publish all the current discount offers going on in a city's super markets. The visitors should be able to see products compare between the supermarkets.

Basically the system will have a generic product catalogue, and every supermarket will be defined in the system. So a product called PlayStation3 will be entered to the system and its prices in every supermarket.

Do you know any ready made script like this?

 

Maybe something like this : http://forums.digitalpoint.com/showthread.php?t=199471