Nissan is dropping the price of its 2013 Leaf to $28,800 for the newly-added S grade, which can be purchased for as low as $18,800 with the $7,500 tax credit and rebates in various states. It also coincides with Nissan moving production of the Leaf to its Tennessee plant along with US production of the electric vehicles lithium ion batteries. Nissan says that the price reductions make it the lowest priced five-passenger electric vehicle sold in the US....