How do I use the passbook 'scan' to identify deals in the supermarket

just got my iphone 4s. am looking at the passbook scan and wonder how I can use it to can items in the grocery stores to identify items on sale/promotions,etc?

The Passbook app itself will not do that (the scan function is for other purposes: http://support.apple.com/kb/HT1212).
Check the app store to see if your supermarket has an app. Most of the larger chains (Harris Teeter, Publix, etc.) do.

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