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.
Enclosed are the complete set of changes for the 2013 F30 3 series, as well as the 2013 E92/E93 3 series, as of July production. The F30 model line expands with the 328i and 335i xDrive and the F30 M Sport Line has been announced and priced.
The M Sport line is priced at $3,850 for the 328i and $3,200 on 335i model. See the full package details and all 2013 changes inside.