Hey, I had another thought for your possible development on my way into work today. Why not develop it into a community type site where people post about hard to find stuff that they bought. You could even do it as a simple Word Press site where people send you a picture and information about the item they bought and where they found it. Just a thought, but this could also be used to play off of the .in hack as well, example:
bought.in/usa/texas/dallas/<name_of_store>/<name_of_hard_to_find_or_unique_item>.html
At any rate, if I was going to develop it I would for sure do something similar to that to get geo ranking bumps.