Flea market-style mobile apps are both a dime a dozen and refreshingly straightforward. Upload a photo of the item for sale, write a description, set a price, and wait for nearby interested buyers to
<a title="Stuffle" target="_blank" href="http://stuffle.it">Stuffle</a>, the mobile location-based marketplace for used items (and European rival to <a href="https://techcrunch.com/2012/11/06/shpock/"