Not really a startup (and has changed quite a bit since selling it), but my site http://iPadCaseFinder.com/ http://iPadCaseFinder.com/ (Used to be a case findin

Not really a startup (and has changed quite a bit since selling it), but my site http://iPadCaseFinder.com/ http://iPadCaseFinder.com/ (Used to be a case finding resource, which aff linked to Amazon) was profitable from day one. Bought a template of ThemeForest, customised it, and created a filtering plugin, then launched it. Received 50,000 uniques in the first week through blog posts. Earned around $6000 from it in 3 months.