Here are the official pricing guides for the 2013 3 Series Coupe (E92) and Convertible (E93) [download PDFs below].
The pricing listed in the guides are effective July 1, 2012. All models see a $200 price increase over the 2012 model year prices (as of September 2011). Production of the 2013 3 Series will begin in July.
For a list of July production changes (very minimal), see http://www.e90post.com/forums/showthread.php?t=691491
* Click to download 2013 E92 coupe price guide *
* Click to download 2013 E93 convertible price guide *