This needs crowdsourced data with extremely short shelf life (if you pardon the pun).

I don’t understand how this will ever work unless you find a more automatic way to get the data. Some ideas:

- Cooperate with the grocery store, and integrate with their existing inventory systems.

- Build the app around a smart shopping list. Automatically suggest the nearest store that is most likely to have everything on my list in stock. For any items I’ve added but didn’t check off after I left the store, report it automatically as not available, to build up the database.

- Something something AR?