Tips on Buying Cars: Maserati Quattroporte invoice cost, factory incentive and hold back, 2006 maserati quattroporte, maserati quattroporte

Question
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!!!

Answer
Apparently, Maserati doesn't release invoice numbers, as I couldn't find any reference, either.  I can't help but be reminded of the old saying, "if you have to ask..."  I mean, if one can afford a Maserati, does it really matter what the invoice is?  If it's the "best price" you're after, then fax a bid request to every Maserati dealer within 200 miles (easily accessible from the US website, http://www.maseratiamerica.com), making it clear that you're serious about purchasing a Quattroporte and will purchase from whichever dealer offers the best price.