This is a new app.  It helps you compare prices to find the best deal.  For example...whether the 6pack on sale or the 2 liter at regular price is the thriftier choice.

 http://savesense.bagofholdingsllc.com/

Sadly, I don't have a smartphone so I can test this, but my sister says it works.  She says it seems to save money on the overall grocery bill.

Has anyone else tried this or a similar app?