Where can I find out average/exact prices for varies commodities (butter, milk, ham, etc..) in France?

Question

I am searching for Parisian shopping pages listing prices, or any kind of page that would give me recent data.

Sparing that, if anyone knows approximate prices for these goods, as well as fruits, breads, and the like, post that would help me out greatly!

Answer 1

On website :

http://www.ooshop.fr  (for paris use as a post code "code postal" 75008 )

http://www.telemarket.fr

Answer 2

As said above, on French internet shopping centres. Opoo is a good one as it is for Carrefour, a giant French retailer.