2006 Maserati Quattroporte invoice cost, factory incentives and factory hold back?

[DEWAYNE]

I need as much of the following as you can get. For the 2005 and 2006 Maserati Quattroporte Base model, Executive GT model and Sport GT model: the invoice cost, amount of factory incentive and amount of factory hold back. I already know the MSRP for these three models are $103,700, $115,900, and $112,200, respectively. A quick search on Google yielded no info.
Thank you!!!