Cash For Clunkers was a little too good to the Toyota Prius, leading to shortages across the country in August and an actual decrease in sales over July's numbers.  Compared to August 2008, though, Prius sales were through the roof, up 45.7 percent.  When will the Prius show back up on lots?  Will September's numbers decrease substantially due to the lack of C4C and no stock?  September has been a month of spiking gas prices (at least on the East Coast) due to hurricane season, so it should be an interesting month for the 2010 Prius.