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http://www.tableausoftware.com/public/gallery
Download their software, it is free I believe and create your map.
It will take some work, but if you don't want to outsource the work/maps, then this is it.
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BTW - that is a pretty innovative idea based on your specific business... it might show you where to market to! Don't discount that value of that. Maybe you could have someone stand out in a costume handing out cards at the "hot" intersections. Just saying... you have to get creative with your marketing.