Who stocks this search?

Have you ever tried to find out whether your nearest highstreet shop will stock the item you want (or an item of the type you want)? It's a pain. I would definitely make use of a "Who stocks this?" search engine, especially if it were linked with a businesses search engine (i.e. "Who stocks this near/in X?").

How would it work? Shops would need to submit stock data to the search engine, which would categorise it and search it for the customer. Whilst this could be difficult for smaller shops, it could be a standard exportable dataset from an electronic stock control system.