[estel]

Yes, this does work, but it would be far easier to use the standard zero-weight "Grocery item" barcode that most supermarkets have (Sainsburys and Coop do) which prompts for a price with no checksum.

(* if you were just intending to scam your supermarket anyway...)

[Kudos]

This way when you scan the item, it will be identified as the product you are purchasing. Supermarkets frequently discount items by an extra order of magnitude by accident and if you were caught doing it this way they may not immediately think you're scamming them.