Sunforce 12-Volt 400-Watt Wind Power Generator for $478.91 shipped.  Here is a screenshot for your reference.  It uses wind to generate power and is made of weatherproof cast aluminum with carbon fiber composite blades.  This wind power generator has an integrated regulator that automatically shuts down when the batteries are completely charged.  Note it uses a 12-volt battery, which is not included.  As a comparison, Home Depot has it for $579.