Plug in for visitors to request Store in their area?

Hi all,

Once upon a time I saw a Store Locator / Directory theme or plug in which allowed site visitors to request that a store come to their area. For stores already added to the request page, other visitors could add their vote (basically up voting it and displaying quantity of votes).

I'm looking for any plug in which allows this capability or which could be easily modified to do so. Visually speaking, ideally there would either be a widget which allows the user input and redirects to a page which list results; second best is the input is on the page of results. There would also be an automatic check to make sure cities already entered are not repeated as new entries.

Thanks in advance!

Mark